Trace Waterfall | Zyeon UI

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status=“ready” · 13 spans over 3 levels on one shared clock. The rules above the bars are the critical path: “POST psp.example/charge” carries 65% of it, while “pricing.quote” and its failing tax call carry none — they ran alongside the payment and finished long before it, so that 504 cost the request nothing. The PSP bar keeps 50 ms of bare track because its four phases do not cover the retry wait.

POST /checkout · p95 sample

trace 9f2c41 · sampled 1 in 200 · budget injected, never read from a clock

13 spans · 3 levels · 1.84 s · 340 ms over budget · 1 failed · POST psp.example/charge is 65% of the critical path

queue 17 ms
serialize 76 ms
db 956 ms
dns 40 ms
tls 116 ms
ttfb 1.19 s
download 52 ms
bare track: time no phase claimed
critical path: the stretch this span was really blocking
failed span
finished with a warning

Every bar sits on one shared clock, so a bar that starts further right started later; nesting is the call tree, and the segments inside a bar are the phases that span reported, in order. The rule above a bar marks the stretch the trace was really waiting on that span; the rules add up to the whole 1.84 s, so a bar with none of them cost the trace nothing. 2 bars are narrower than 2px and drawn at that floor, so their width no longer matches their duration — the real number is in the readout and in the table. Arrow up and down walk the rows, right opens a span, left closes it.

Trace waterfall: 13 spans nested 3 levels deep, finishing 1.84 s after the trace opens. Its critical path covers all 1.84 s, led by POST psp.example/charge at 65%, SELECT cart_items at 16%, auth.verify at 5%. 2 spans contribute nothing to it — they ran alongside something slower, so shortening them would not shorten the trace. Phases seen: queue 17 ms, serialize 76 ms, db 956 ms, dns 40 ms, tls 116 ms, ttfb 1.19 s, download 52 ms. 1 span failed. The budget line sits at 1.5 s, which this trace overran by 340 ms.

Every span on this trace, in the order the arrow keys walk it: its nesting level, when it starts, how long it takes, how much of that is its own work, how much of the critical path it accounts for, and the phases it reported.
Span	Level	Starts at	Duration	Own work	Blocking	Phases	Notes
POST /checkout	1	0 ms	1.84 s	26.6 ms	26.6 ms (1% of the critical path)	not broken down	HTTP 200 · edge-1 · region eu-west
gateway.route	2	2 ms	18 ms	all of it	18 ms (1% of the critical path)	queue 14 ms, serialize 4 ms	edge router
auth.verify	2	22 ms	96 ms	all of it	96 ms (5% of the critical path)	db 74 ms, serialize 22 ms	session cache miss
cart.load	2	124 ms	380 ms	56 ms	8 ms (0% of the critical path)	db 330 ms, serialize 50 ms	3 line items
SELECT cart_items	3	132 ms	324 ms	all of it	298 ms (16% of the critical path)	db 324 ms	postgres · primary
pricing.quote	2	130 ms	286 ms	36 ms	nothing — it ran alongside something slower	not broken down	fell back to cached rates; warning
GET tax.example/rates	3	138 ms	250 ms	all of it	nothing — it ran alongside something slower	dns 18 ms, tls 52 ms, ttfb 168 ms, download 12 ms	504 from the tax vendor; error
ledger.write	2	430 ms	140 ms	all of it	90 ms (5% of the critical path)	db 140 ms	double-entry, both legs
payments.charge	2	520 ms	1.3 s	16 ms	16 ms (1% of the critical path)	not broken down	idempotency key reused
fraud.score	3	524 ms	88 ms	all of it	88 ms (5% of the critical path)	db 88 ms	model v7 · score 0.02
POST psp.example/charge	3	620 ms	1.2 s	all of it	1.2 s (65% of the critical path)	dns 22 ms, tls 64 ms, ttfb 1.02 s, download 40 ms	acquirer timed out once and was retried; 50 ms unattributed
email.enqueue	2	1.82 s	3 ms	all of it	3 ms (0% of the critical path)	queue 3 ms	fire and forget
audit.append	2	1.83 s	400 µs	all of it	400 µs (0% of the critical path)	not broken down	append-only log

onSpanSelect is wired above: click a row, or Tab into the chart and press Enter on one — nothing is pinned, the callback is yours.

Last selection: nothing yet

The same contract a tenth of the scale down — the axis swaps seconds for milliseconds on its own, and “inter.woff2” reads 420 µs instead of 0.00042 s. “app.css”, the font and the paint are all off the critical path: “app.js” was still downloading over the top of them.

Navigation · /pricing

one navigation, millisecond scale — the axis follows the span, not a setting

7 spans · 2 levels · 214 ms · 34 ms over budget · document is 45% of the critical path

dns 6 ms
tls 18 ms
ttfb 124 ms
download 80.4 ms
render 64 ms
critical path: the stretch this span was really blocking
finished with a warning

Every bar sits on one shared clock, so a bar that starts further right started later; nesting is the call tree, and the segments inside a bar are the phases that span reported, in order. The rule above a bar marks the stretch the trace was really waiting on that span; the rules add up to the whole 214 ms, so a bar with none of them cost the trace nothing. 1 bar is narrower than 2px and drawn at that floor, so its width no longer matches its duration — the real number is in the readout and in the table. Arrow up and down walk the rows, right opens a span, left closes it.

Trace waterfall: 7 spans nested 2 levels deep, finishing 214 ms after the trace opens. Its critical path covers all 214 ms, led by document at 45%, app.js at 31%, hydrate at 21%. 3 spans contribute nothing to it — they ran alongside something slower, so shortening them would not shorten the trace. Phases seen: dns 6 ms, tls 18 ms, ttfb 124 ms, download 80.4 ms, render 64 ms. The budget line sits at 180 ms, which this trace overran by 34 ms.

Every span on this trace, in the order the arrow keys walk it: its nesting level, when it starts, how long it takes, how much of that is its own work, how much of the critical path it accounts for, and the phases it reported.
Span	Level	Starts at	Duration	Own work	Blocking	Phases	Notes
GET /pricing	1	0 ms	214 ms	5 ms	5 ms (2% of the critical path)	not broken down	navigation
document	2	1 ms	96 ms	all of it	96 ms (45% of the critical path)	dns 6 ms, tls 18 ms, ttfb 60 ms, download 12 ms	text/html · 14 kB
app.js	2	99 ms	88 ms	all of it	67 ms (31% of the critical path)	ttfb 30 ms, download 58 ms	module preload
app.css	2	99 ms	44 ms	all of it	nothing — it ran alongside something slower	ttfb 34 ms, download 10 ms	render blocking
inter.woff2	2	143 ms	420 µs	all of it	nothing — it ran alongside something slower	download 420 µs	blocked on the connection pool
paint	2	147 ms	18 ms	all of it	nothing — it ran alongside something slower	render 18 ms	first contentful paint at 158 ms
hydrate	2	166 ms	46 ms	all of it	46 ms (21% of the critical path)	render 46 ms	long task; warning

collapseBelowDepth={1} · a generated 35-span tree five levels deep, opened as an outline. A collapsed row keeps a dashed bracket for the extent of what it hides and a +N count in the gutter, and the critical-path rules of the hidden spans roll up onto it. Press → on a row to open it, ← to close it.

GET /dashboard · fan-out

generated with a fixed seed · five levels, a third of the siblings overlapping

35 spans · 5 levels · 2.4 s · 400 ms over budget · GET /dashboard is 15% of the critical path

db 1.44 s
serialize 685 ms
network 1.15 s
render 665 ms
queue 1.77 s
critical path: the stretch this span was really blocking

Trace waterfall: 35 spans nested 5 levels deep, finishing 2.4 s after the trace opens. Its critical path covers all 2.4 s, led by GET /dashboard at 15%, port.back up at 9%, transmitter.hack at 8%. 2 spans contribute nothing to it — they ran alongside something slower, so shortening them would not shorten the trace. Phases seen: db 1.44 s, serialize 685 ms, network 1.15 s, render 665 ms, queue 1.77 s. The budget line sits at 2 s, which this trace overran by 400 ms.

Every span on this trace, in the order the arrow keys walk it: its nesting level, when it starts, how long it takes, how much of that is its own work, how much of the critical path it accounts for, and the phases it reported.
Span	Level	Starts at	Duration	Own work	Blocking	Phases	Notes
GET /dashboard	1	0 ms	2.4 s	357 ms	357 ms (15% of the critical path)	not broken down	server render
port.back up	2	9 ms	854 ms	207 ms	207 ms (9% of the critical path)	db 752 ms, serialize 102 ms	12 nested spans collapsed
alarm.copy	3	19 ms	460 ms	360 ms	107 ms (4% of the critical path)	db 405 ms, serialize 55 ms	5 nested spans collapsed
circuit.synthesize	4	29 ms	22 ms	all of it	10 ms (0% of the critical path)	network 19 ms, serialize 3 ms	nothing unusual
bandwidth.bypass	4	39 ms	90 ms	42 ms	42 ms (2% of the critical path)	network 79 ms, serialize 11 ms	3 nested spans collapsed
system.input	5	47 ms	16 ms	all of it	16 ms (1% of the critical path)	network 14 ms, serialize 2 ms	nothing unusual
feed.compress	5	71 ms	28 ms	all of it	13 ms (1% of the critical path)	db 25 ms, serialize 3 ms	nothing unusual
monitor.program	5	84 ms	19 ms	all of it	19 ms (1% of the critical path)	render 17 ms, serialize 2 ms	nothing unusual
bus.program	3	226 ms	440 ms	82 ms	82 ms (3% of the critical path)	network 387 ms, serialize 53 ms	5 nested spans collapsed
system.calculate	4	236 ms	294 ms	118 ms	118 ms (5% of the critical path)	queue 259 ms, serialize 35 ms	2 nested spans collapsed
circuit.calculate	5	240 ms	46 ms	all of it	46 ms (2% of the critical path)	render 40 ms, serialize 6 ms	nothing unusual
bus.back up	5	288 ms	130 ms	all of it	130 ms (5% of the critical path)	network 114 ms, serialize 16 ms	nothing unusual
matrix.hack	4	543 ms	64 ms	30 ms	30 ms (1% of the critical path)	render 56 ms, serialize 8 ms	1 nested spans collapsed
microchip.back up	5	549 ms	34 ms	all of it	34 ms (1% of the critical path)	network 30 ms, serialize 4 ms	nothing unusual
application.synthesize	2	875 ms	404 ms	179 ms	179 ms (7% of the critical path)	render 356 ms, serialize 48 ms	6 nested spans collapsed
matrix.override	3	880 ms	164 ms	68 ms	68 ms (3% of the critical path)	queue 144 ms, serialize 20 ms	3 nested spans collapsed
application.bypass	4	889 ms	96 ms	39 ms	39 ms (2% of the critical path)	render 84 ms, serialize 12 ms	2 nested spans collapsed
bus.copy	5	893 ms	20 ms	all of it	20 ms (1% of the critical path)	db 18 ms, serialize 2 ms	nothing unusual
panel.copy	5	917 ms	37 ms	all of it	37 ms (2% of the critical path)	db 33 ms, serialize 4 ms	nothing unusual
microchip.copy	3	1.05 s	61 ms	39 ms	39 ms (2% of the critical path)	queue 54 ms, serialize 7 ms	1 nested spans collapsed
pixel.quantify	4	1.06 s	22 ms	all of it	22 ms (1% of the critical path)	render 19 ms, serialize 3 ms	nothing unusual
application.override	2	1.28 s	541 ms	171 ms	7 ms (0% of the critical path)	queue 476 ms, serialize 65 ms	3 nested spans collapsed
bandwidth.synthesize	3	1.29 s	370 ms	185 ms	51 ms (2% of the critical path)	network 326 ms, serialize 44 ms	2 nested spans collapsed
transmitter.navigate	4	1.29 s	49 ms	all of it	49 ms (2% of the critical path)	network 43 ms, serialize 6 ms	nothing unusual
hard drive.index	4	1.35 s	136 ms	all of it	136 ms (6% of the critical path)	queue 120 ms, serialize 16 ms	nothing unusual
transmitter.hack	2	1.52 s	542 ms	183 ms	183 ms (8% of the critical path)	queue 477 ms, serialize 65 ms	9 nested spans collapsed
feed.bypass	3	1.53 s	274 ms	80 ms	80 ms (3% of the critical path)	queue 241 ms, serialize 33 ms	5 nested spans collapsed
transmitter.calculate	4	1.54 s	175 ms	135 ms	124 ms (5% of the critical path)	db 154 ms, serialize 21 ms	2 nested spans collapsed
interface.compress	5	1.54 s	40 ms	all of it	40 ms (2% of the critical path)	db 35 ms, serialize 5 ms	nothing unusual
capacitor.copy	5	1.56 s	19 ms	all of it	nothing — it ran alongside something slower	db 17 ms, serialize 2 ms	nothing unusual
panel.navigate	4	1.61 s	76 ms	all of it	nothing — it ran alongside something slower	network 67 ms, serialize 9 ms	nothing unusual
panel.program	4	1.7 s	30 ms	all of it	30 ms (1% of the critical path)	network 26 ms, serialize 4 ms	nothing unusual
card.input	3	1.81 s	85 ms	38 ms	38 ms (2% of the critical path)	render 75 ms, serialize 10 ms	2 nested spans collapsed
matrix.reboot	4	1.81 s	47 ms	26 ms	26 ms (1% of the critical path)	network 41 ms, serialize 6 ms	1 nested spans collapsed
panel.input	5	1.82 s	21 ms	all of it	21 ms (1% of the critical path)	render 18 ms, serialize 3 ms	nothing unusual

density=“compact” · criticalPath={false} — 18px rows, no phase names printed inside the segments and no critical rules, for a sidebar where the shape of the trace is the whole message.

GET /dashboard · fan-out

generated with a fixed seed · five levels, a third of the siblings overlapping

35 spans · 5 levels · 2.4 s · 400 ms over budget

db 1.44 s
serialize 685 ms
network 1.15 s
render 665 ms
queue 1.77 s

Trace waterfall: 35 spans nested 5 levels deep, finishing 2.4 s after the trace opens. Phases seen: db 1.44 s, serialize 685 ms, network 1.15 s, render 665 ms, queue 1.77 s. The budget line sits at 2 s, which this trace overran by 400 ms.

Every span on this trace, in the order the arrow keys walk it: its nesting level, when it starts, how long it takes, how much of that is its own work, how much of the critical path it accounts for, and the phases it reported.
Span	Level	Starts at	Duration	Own work	Blocking	Phases	Notes
GET /dashboard	1	0 ms	2.4 s	357 ms	357 ms (15% of the critical path)	not broken down	server render
port.back up	2	9 ms	854 ms	207 ms	207 ms (9% of the critical path)	db 752 ms, serialize 102 ms	nothing unusual
alarm.copy	3	19 ms	460 ms	360 ms	107 ms (4% of the critical path)	db 405 ms, serialize 55 ms	nothing unusual
circuit.synthesize	4	29 ms	22 ms	all of it	10 ms (0% of the critical path)	network 19 ms, serialize 3 ms	nothing unusual
bandwidth.bypass	4	39 ms	90 ms	42 ms	42 ms (2% of the critical path)	network 79 ms, serialize 11 ms	nothing unusual
system.input	5	47 ms	16 ms	all of it	16 ms (1% of the critical path)	network 14 ms, serialize 2 ms	nothing unusual
feed.compress	5	71 ms	28 ms	all of it	13 ms (1% of the critical path)	db 25 ms, serialize 3 ms	nothing unusual
monitor.program	5	84 ms	19 ms	all of it	19 ms (1% of the critical path)	render 17 ms, serialize 2 ms	nothing unusual
bus.program	3	226 ms	440 ms	82 ms	82 ms (3% of the critical path)	network 387 ms, serialize 53 ms	nothing unusual
system.calculate	4	236 ms	294 ms	118 ms	118 ms (5% of the critical path)	queue 259 ms, serialize 35 ms	nothing unusual
circuit.calculate	5	240 ms	46 ms	all of it	46 ms (2% of the critical path)	render 40 ms, serialize 6 ms	nothing unusual
bus.back up	5	288 ms	130 ms	all of it	130 ms (5% of the critical path)	network 114 ms, serialize 16 ms	nothing unusual
matrix.hack	4	543 ms	64 ms	30 ms	30 ms (1% of the critical path)	render 56 ms, serialize 8 ms	nothing unusual
microchip.back up	5	549 ms	34 ms	all of it	34 ms (1% of the critical path)	network 30 ms, serialize 4 ms	nothing unusual
application.synthesize	2	875 ms	404 ms	179 ms	179 ms (7% of the critical path)	render 356 ms, serialize 48 ms	nothing unusual
matrix.override	3	880 ms	164 ms	68 ms	68 ms (3% of the critical path)	queue 144 ms, serialize 20 ms	nothing unusual
application.bypass	4	889 ms	96 ms	39 ms	39 ms (2% of the critical path)	render 84 ms, serialize 12 ms	nothing unusual
bus.copy	5	893 ms	20 ms	all of it	20 ms (1% of the critical path)	db 18 ms, serialize 2 ms	nothing unusual
panel.copy	5	917 ms	37 ms	all of it	37 ms (2% of the critical path)	db 33 ms, serialize 4 ms	nothing unusual
microchip.copy	3	1.05 s	61 ms	39 ms	39 ms (2% of the critical path)	queue 54 ms, serialize 7 ms	nothing unusual
pixel.quantify	4	1.06 s	22 ms	all of it	22 ms (1% of the critical path)	render 19 ms, serialize 3 ms	nothing unusual
application.override	2	1.28 s	541 ms	171 ms	7 ms (0% of the critical path)	queue 476 ms, serialize 65 ms	nothing unusual
bandwidth.synthesize	3	1.29 s	370 ms	185 ms	51 ms (2% of the critical path)	network 326 ms, serialize 44 ms	nothing unusual
transmitter.navigate	4	1.29 s	49 ms	all of it	49 ms (2% of the critical path)	network 43 ms, serialize 6 ms	nothing unusual
hard drive.index	4	1.35 s	136 ms	all of it	136 ms (6% of the critical path)	queue 120 ms, serialize 16 ms	nothing unusual
transmitter.hack	2	1.52 s	542 ms	183 ms	183 ms (8% of the critical path)	queue 477 ms, serialize 65 ms	nothing unusual
feed.bypass	3	1.53 s	274 ms	80 ms	80 ms (3% of the critical path)	queue 241 ms, serialize 33 ms	nothing unusual
transmitter.calculate	4	1.54 s	175 ms	135 ms	124 ms (5% of the critical path)	db 154 ms, serialize 21 ms	nothing unusual
interface.compress	5	1.54 s	40 ms	all of it	40 ms (2% of the critical path)	db 35 ms, serialize 5 ms	nothing unusual
capacitor.copy	5	1.56 s	19 ms	all of it	nothing — it ran alongside something slower	db 17 ms, serialize 2 ms	nothing unusual
panel.navigate	4	1.61 s	76 ms	all of it	nothing — it ran alongside something slower	network 67 ms, serialize 9 ms	nothing unusual
panel.program	4	1.7 s	30 ms	all of it	30 ms (1% of the critical path)	network 26 ms, serialize 4 ms	nothing unusual
card.input	3	1.81 s	85 ms	38 ms	38 ms (2% of the critical path)	render 75 ms, serialize 10 ms	nothing unusual
matrix.reboot	4	1.81 s	47 ms	26 ms	26 ms (1% of the critical path)	network 41 ms, serialize 6 ms	nothing unusual
panel.input	5	1.82 s	21 ms	all of it	21 ms (1% of the critical path)	render 18 ms, serialize 3 ms	nothing unusual

minBarWidth={6} · labelWidth={150} — a wider floor pulls the 0.4 ms audit span up to something you can point at, and the footnote owns up to the bars whose width no longer matches their duration. The narrower gutter elides the longer names, which keep their full text in the tooltip and in the table.

POST /checkout · p95 sample

trace 9f2c41 · sampled 1 in 200 · budget injected, never read from a clock

13 spans · 3 levels · 1.84 s · 340 ms over budget · 1 failed · POST psp.example/charge is 65% of the critical path

queue 17 ms
serialize 76 ms
db 956 ms
dns 40 ms
tls 116 ms
ttfb 1.19 s
download 52 ms
bare track: time no phase claimed
critical path: the stretch this span was really blocking
failed span
finished with a warning

Every bar sits on one shared clock, so a bar that starts further right started later; nesting is the call tree, and the segments inside a bar are the phases that span reported, in order. The rule above a bar marks the stretch the trace was really waiting on that span; the rules add up to the whole 1.84 s, so a bar with none of them cost the trace nothing. 3 bars are narrower than 6px and drawn at that floor, so their width no longer matches their duration — the real number is in the readout and in the table. Arrow up and down walk the rows, right opens a span, left closes it.

Every span on this trace, in the order the arrow keys walk it: its nesting level, when it starts, how long it takes, how much of that is its own work, how much of the critical path it accounts for, and the phases it reported.
Span	Level	Starts at	Duration	Own work	Blocking	Phases	Notes
POST /checkout	1	0 ms	1.84 s	26.6 ms	26.6 ms (1% of the critical path)	not broken down	HTTP 200 · edge-1 · region eu-west
gateway.route	2	2 ms	18 ms	all of it	18 ms (1% of the critical path)	queue 14 ms, serialize 4 ms	edge router
auth.verify	2	22 ms	96 ms	all of it	96 ms (5% of the critical path)	db 74 ms, serialize 22 ms	session cache miss
cart.load	2	124 ms	380 ms	56 ms	8 ms (0% of the critical path)	db 330 ms, serialize 50 ms	3 line items
SELECT cart_items	3	132 ms	324 ms	all of it	298 ms (16% of the critical path)	db 324 ms	postgres · primary
pricing.quote	2	130 ms	286 ms	36 ms	nothing — it ran alongside something slower	not broken down	fell back to cached rates; warning
GET tax.example/rates	3	138 ms	250 ms	all of it	nothing — it ran alongside something slower	dns 18 ms, tls 52 ms, ttfb 168 ms, download 12 ms	504 from the tax vendor; error
ledger.write	2	430 ms	140 ms	all of it	90 ms (5% of the critical path)	db 140 ms	double-entry, both legs
payments.charge	2	520 ms	1.3 s	16 ms	16 ms (1% of the critical path)	not broken down	idempotency key reused
fraud.score	3	524 ms	88 ms	all of it	88 ms (5% of the critical path)	db 88 ms	model v7 · score 0.02
POST psp.example/charge	3	620 ms	1.2 s	all of it	1.2 s (65% of the critical path)	dns 22 ms, tls 64 ms, ttfb 1.02 s, download 40 ms	acquirer timed out once and was retried; 50 ms unattributed
email.enqueue	2	1.82 s	3 ms	all of it	3 ms (0% of the critical path)	queue 3 ms	fire and forget
audit.append	2	1.83 s	400 µs	all of it	400 µs (0% of the critical path)	not broken down	append-only log

Degenerate feed · an offset that is not a number, a repeated id, a parent nobody sent, a parent chain that loops, a negative length, a child running far outside its parent, phases claiming 90 ms of a 60 ms span, a phase length of NaN, a span attributing a third of itself, a 0.2 ms hairline and a name longer than any bar. Everything that could not be drawn as recorded is counted under the header.

Data-quality stress test

deliberately broken feed — the note under the header counts what could not be drawn

10 spans · 3 levels · 900 ms · 300 ms over budget · GET /reports/quarterly-revenue-by-region-and-segment is 81% of the critical path

1 span has an offset or a length that is not a number · 1 repeated id · 1 span names a parent nobody sent · 1 parent chain closed a loop · 1 phase has a length that is not a number — dropped or re-rooted, never drawn as recorded.

db 86 ms
bare track: time no phase claimed
critical path: the stretch this span was really blocking
finished with a warning

Every bar sits on one shared clock, so a bar that starts further right started later; nesting is the call tree, and the segments inside a bar are the phases that span reported, in order. The rule above a bar marks the stretch the trace was really waiting on that span; the rules add up to the whole 900 ms, so a bar with none of them cost the trace nothing. 2 bars are narrower than 2px and drawn at that floor, so their width no longer matches their duration — the real number is in the readout and in the table. 1 span runs outside the span that contains it, which is drawn where the numbers put it rather than tidied away. Arrow up and down walk the rows, right opens a span, left closes it.

Trace waterfall: 10 spans nested 3 levels deep, finishing 900 ms after the trace opens. Its critical path covers all 900 ms, led by GET /reports/quarterly-revenue-by-region-and-segment at 81%, third.attributed at 8%, phases.overrun at 7%. 5 spans contribute nothing to it — they ran alongside something slower, so shortening them would not shorten the trace. Phases seen: db 86 ms. The budget line sits at 600 ms, which this trace overran by 300 ms.

Every span on this trace, in the order the arrow keys walk it: its nesting level, when it starts, how long it takes, how much of that is its own work, how much of the critical path it accounts for, and the phases it reported.
Span	Level	Starts at	Duration	Own work	Blocking	Phases	Notes
GET /reports/quarterly-revenue-by-region-and-segment	1	0 ms	900 ms	730 ms	730 ms (81% of the critical path)	not broken down	the label is longer than any bar on this card
negative.length	2	300 ms	0 ms	all of it	nothing — it ran alongside something slower	not broken down	negative length, clamped to an instant
tiny.wrapper	2	380 ms	40 ms	0 ms	nothing — it ran alongside something slower	not broken down	nothing unusual
escapes.its.parent	3	100 ms	700 ms	all of it	40 ms (4% of the critical path)	not broken down	runs outside its parent
phases.overrun	2	500 ms	60 ms	all of it	60 ms (7% of the critical path)	db 60 ms	phases overrun by 30 ms, clipped
hairline.span	2	700 ms	200 µs	all of it	200 µs (0% of the critical path)	not broken down	nothing unusual
third.attributed	2	820 ms	70 ms	all of it	70 ms (8% of the critical path)	db 26 ms	warning; 44 ms unattributed
orphan.child	1	40 ms	120 ms	all of it	nothing — it ran alongside something slower	not broken down	nothing unusual
loop.a	1	750 ms	60 ms	20 ms	nothing — it ran alongside something slower	not broken down	nothing unusual
loop.b	2	760 ms	40 ms	all of it	nothing — it ran alongside something slower	not broken down	nothing unusual

Every span unplaceable · the collector answered and not one offset in the answer is a number. That is not “empty” and not a failed fetch, so the layout refuses and says which input it could not use.

Trace 00000 · collector mismatch

the collector answered, and nothing in the answer carries a usable offset

This trace can’t be drawn

None of the 3 spans could be put on a clock: 3 spans have an offset or a length that is not a number.

status=“empty” — a valid contract with nothing recorded, told apart from loading and from a failed fetch.

POST /checkout · p95 sample

trace 9f2c41 · sampled 1 in 200 · budget injected, never read from a clock

Nothing recorded on this trace

Bars appear here once a span carries an offset and a length on the trace clock.

status=“loading” — a deterministic skeleton, aria-hidden, no timers involved.

POST /checkout · p95 sample

trace 9f2c41 · sampled 1 in 200 · budget injected, never read from a clock

status=“error” with onRetry — retried 0 times. Drop onRetry and the button disappears rather than sitting there doing nothing.

POST /checkout · p95 sample

trace 9f2c41 · sampled 1 in 200 · budget injected, never read from a clock

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Every span on this trace, in the order the arrow keys walk it: its nesting level, when it starts, how long it takes, how much of that is its own work, how much of the critical path it accounts for, and the phases it reported.

Span

Level

Starts at

Duration

Own work

Blocking

Phases

Notes

GET /dashboard

0 ms

2.4 s

357 ms

357 ms (15% of the critical path)

not broken down

server render

port.back up

9 ms

854 ms

207 ms

207 ms (9% of the critical path)

db 752 ms, serialize 102 ms

12 nested spans collapsed

alarm.copy

19 ms

460 ms

360 ms

107 ms (4% of the critical path)

db 405 ms, serialize 55 ms

5 nested spans collapsed

circuit.synthesize

29 ms

22 ms

all of it

10 ms (0% of the critical path)

network 19 ms, serialize 3 ms

nothing unusual

bandwidth.bypass

39 ms

90 ms

42 ms

42 ms (2% of the critical path)

network 79 ms, serialize 11 ms

3 nested spans collapsed

system.input

47 ms

16 ms

all of it

16 ms (1% of the critical path)

network 14 ms, serialize 2 ms

nothing unusual

feed.compress

71 ms

28 ms

all of it

13 ms (1% of the critical path)

db 25 ms, serialize 3 ms

nothing unusual

monitor.program

84 ms

19 ms

all of it

19 ms (1% of the critical path)

render 17 ms, serialize 2 ms

nothing unusual

bus.program

226 ms

440 ms

82 ms

82 ms (3% of the critical path)

network 387 ms, serialize 53 ms

5 nested spans collapsed

system.calculate

236 ms

294 ms

118 ms

118 ms (5% of the critical path)

queue 259 ms, serialize 35 ms

2 nested spans collapsed

circuit.calculate

240 ms

46 ms

all of it

46 ms (2% of the critical path)

render 40 ms, serialize 6 ms

nothing unusual

bus.back up

288 ms

130 ms

all of it

130 ms (5% of the critical path)

network 114 ms, serialize 16 ms

nothing unusual

matrix.hack

543 ms

64 ms

30 ms

30 ms (1% of the critical path)

render 56 ms, serialize 8 ms

1 nested spans collapsed

microchip.back up

549 ms

34 ms

all of it

34 ms (1% of the critical path)

network 30 ms, serialize 4 ms

nothing unusual

application.synthesize

875 ms

404 ms

179 ms

179 ms (7% of the critical path)

render 356 ms, serialize 48 ms

6 nested spans collapsed

matrix.override

880 ms

164 ms

68 ms

68 ms (3% of the critical path)

queue 144 ms, serialize 20 ms

3 nested spans collapsed

application.bypass

889 ms

96 ms

39 ms

39 ms (2% of the critical path)

render 84 ms, serialize 12 ms

2 nested spans collapsed

bus.copy

893 ms

20 ms

all of it

20 ms (1% of the critical path)

db 18 ms, serialize 2 ms

nothing unusual

panel.copy

917 ms

37 ms

all of it

37 ms (2% of the critical path)

db 33 ms, serialize 4 ms

nothing unusual

microchip.copy

1.05 s

61 ms

39 ms

39 ms (2% of the critical path)

queue 54 ms, serialize 7 ms

1 nested spans collapsed

pixel.quantify

1.06 s

22 ms

all of it

22 ms (1% of the critical path)

render 19 ms, serialize 3 ms

nothing unusual

application.override

1.28 s

541 ms

171 ms

7 ms (0% of the critical path)

queue 476 ms, serialize 65 ms

3 nested spans collapsed

bandwidth.synthesize

1.29 s

370 ms

185 ms

51 ms (2% of the critical path)

network 326 ms, serialize 44 ms

2 nested spans collapsed

transmitter.navigate

1.29 s

49 ms

all of it

49 ms (2% of the critical path)

network 43 ms, serialize 6 ms

nothing unusual

hard drive.index

1.35 s

136 ms

all of it

136 ms (6% of the critical path)

queue 120 ms, serialize 16 ms

nothing unusual

transmitter.hack

1.52 s

542 ms

183 ms

183 ms (8% of the critical path)

queue 477 ms, serialize 65 ms

9 nested spans collapsed

feed.bypass

1.53 s

274 ms

80 ms

80 ms (3% of the critical path)

queue 241 ms, serialize 33 ms

5 nested spans collapsed

transmitter.calculate

1.54 s

175 ms

135 ms

124 ms (5% of the critical path)

db 154 ms, serialize 21 ms

2 nested spans collapsed

interface.compress

1.54 s

40 ms

all of it

40 ms (2% of the critical path)

db 35 ms, serialize 5 ms

nothing unusual

capacitor.copy

1.56 s

19 ms

all of it

nothing — it ran alongside something slower

db 17 ms, serialize 2 ms

nothing unusual

panel.navigate

1.61 s

76 ms

all of it

nothing — it ran alongside something slower

network 67 ms, serialize 9 ms

nothing unusual

panel.program

1.7 s

30 ms

all of it

30 ms (1% of the critical path)

network 26 ms, serialize 4 ms

nothing unusual

card.input

1.81 s

85 ms

38 ms

38 ms (2% of the critical path)

render 75 ms, serialize 10 ms

2 nested spans collapsed

matrix.reboot

1.81 s

47 ms

26 ms

26 ms (1% of the critical path)

network 41 ms, serialize 6 ms

1 nested spans collapsed

panel.input

1.82 s

21 ms

all of it

21 ms (1% of the critical path)

render 18 ms, serialize 3 ms

nothing unusual

Span

Level

Starts at

Duration

Own work

Blocking

Phases

Notes

GET /dashboard

0 ms

2.4 s

357 ms

357 ms (15% of the critical path)

not broken down

server render

port.back up

9 ms

854 ms

207 ms

207 ms (9% of the critical path)

db 752 ms, serialize 102 ms

nothing unusual

alarm.copy

19 ms

460 ms

360 ms

107 ms (4% of the critical path)

db 405 ms, serialize 55 ms

nothing unusual

circuit.synthesize

29 ms

22 ms

all of it

10 ms (0% of the critical path)

network 19 ms, serialize 3 ms

nothing unusual

bandwidth.bypass

39 ms

90 ms

42 ms

42 ms (2% of the critical path)

network 79 ms, serialize 11 ms

nothing unusual

system.input

47 ms

16 ms

all of it

16 ms (1% of the critical path)

network 14 ms, serialize 2 ms

nothing unusual

feed.compress

71 ms

28 ms

all of it

13 ms (1% of the critical path)

db 25 ms, serialize 3 ms

nothing unusual

monitor.program

84 ms

19 ms

all of it

19 ms (1% of the critical path)

render 17 ms, serialize 2 ms

nothing unusual

bus.program

226 ms

440 ms

82 ms

82 ms (3% of the critical path)

network 387 ms, serialize 53 ms

nothing unusual

system.calculate

236 ms

294 ms

118 ms

118 ms (5% of the critical path)

queue 259 ms, serialize 35 ms

nothing unusual

circuit.calculate

240 ms

46 ms

all of it

46 ms (2% of the critical path)

render 40 ms, serialize 6 ms

nothing unusual

bus.back up

288 ms

130 ms

all of it

130 ms (5% of the critical path)

network 114 ms, serialize 16 ms

nothing unusual

matrix.hack

543 ms

64 ms

30 ms

30 ms (1% of the critical path)

render 56 ms, serialize 8 ms

nothing unusual

microchip.back up

549 ms

34 ms

all of it

34 ms (1% of the critical path)

network 30 ms, serialize 4 ms

nothing unusual

application.synthesize

875 ms

404 ms

179 ms

179 ms (7% of the critical path)

render 356 ms, serialize 48 ms

nothing unusual

matrix.override

880 ms

164 ms

68 ms

68 ms (3% of the critical path)

queue 144 ms, serialize 20 ms

nothing unusual

application.bypass

889 ms

96 ms

39 ms

39 ms (2% of the critical path)

render 84 ms, serialize 12 ms

nothing unusual

bus.copy

893 ms

20 ms

all of it

20 ms (1% of the critical path)

db 18 ms, serialize 2 ms

nothing unusual

panel.copy

917 ms

37 ms

all of it

37 ms (2% of the critical path)

db 33 ms, serialize 4 ms

nothing unusual

microchip.copy

1.05 s

61 ms

39 ms

39 ms (2% of the critical path)

queue 54 ms, serialize 7 ms

nothing unusual

pixel.quantify

1.06 s

22 ms

all of it

22 ms (1% of the critical path)

render 19 ms, serialize 3 ms

nothing unusual

application.override

1.28 s

541 ms

171 ms

7 ms (0% of the critical path)

queue 476 ms, serialize 65 ms

nothing unusual

bandwidth.synthesize

1.29 s

370 ms

185 ms

51 ms (2% of the critical path)

network 326 ms, serialize 44 ms

nothing unusual

transmitter.navigate

1.29 s

49 ms

all of it

49 ms (2% of the critical path)

network 43 ms, serialize 6 ms

nothing unusual

hard drive.index

1.35 s

136 ms

all of it

136 ms (6% of the critical path)

queue 120 ms, serialize 16 ms

nothing unusual

transmitter.hack

1.52 s

542 ms

183 ms

183 ms (8% of the critical path)

queue 477 ms, serialize 65 ms

nothing unusual

feed.bypass

1.53 s

274 ms

80 ms

80 ms (3% of the critical path)

queue 241 ms, serialize 33 ms

nothing unusual

transmitter.calculate

1.54 s

175 ms

135 ms

124 ms (5% of the critical path)

db 154 ms, serialize 21 ms

nothing unusual

interface.compress

1.54 s

40 ms

all of it

40 ms (2% of the critical path)

db 35 ms, serialize 5 ms

nothing unusual

capacitor.copy

1.56 s

19 ms

all of it

nothing — it ran alongside something slower

db 17 ms, serialize 2 ms

nothing unusual

panel.navigate

1.61 s

76 ms

all of it

nothing — it ran alongside something slower

network 67 ms, serialize 9 ms

nothing unusual

panel.program

1.7 s

30 ms

all of it

30 ms (1% of the critical path)

network 26 ms, serialize 4 ms

nothing unusual

card.input

1.81 s

85 ms

38 ms

38 ms (2% of the critical path)

render 75 ms, serialize 10 ms

nothing unusual

matrix.reboot

1.81 s

47 ms

26 ms

26 ms (1% of the critical path)

network 41 ms, serialize 6 ms

nothing unusual

panel.input

1.82 s

21 ms

all of it

21 ms (1% of the critical path)

render 18 ms, serialize 3 ms

nothing unusual