[core] Decode replay payloads synchronously by NathanColosimo · Pull Request #3547 · vercel/workflow

NathanColosimo · 2026-08-14T03:54:31Z

Summary

retain raw AES key material beside module-imported non-extractable CryptoKeys
use Node createDecipheriv for the common symmetric replay-decrypt path
preserve Web Crypto for portable runtimes, older Node discovery, and sealed-envelope work
keep zstd replay decompression synchronous while retaining the async gzip facade for existing callers
avoid Promise creation when decrypt and decompress both complete synchronously

Compatibility note

The portable module discovers node:crypto through process.getBuiltinModule, which exists on Node 22.3 and newer. Node 18/20 therefore retain the Web Crypto fallback in this version. Splitting this layer makes that compatibility decision reviewable independently from streaming orchestration.

Local latency check on Node 22.18

At 64 KiB, synchronous AES-GCM measured about 12.2 µs per decrypt versus 27.3 µs for sequential Web Crypto. A batch of 16 Web Crypto jobs reached about 12.4 µs/op wall throughput by overlapping work; that is throughput rather than single-event latency.

Stack

[world-vercel] Resume partial replay streams after validated events #3546 — replay stream recovery
[core] Decode replay payloads synchronously #3547 — synchronous replay decode
[core] Prepare replay payloads as event frames arrive #3548 — streamed replay preparation
[core] Trace fresh workflow replay phases #3523 — replay phase tracing
[core] Prune schema modules from workflow bundles #3550 — prune sandbox dependency graph
[workflow] Load per-source replay bundles #3551 — per-source lazy VM bundles

Validation

focused crypto and serialization suite
414 tests passed

changeset-bot · 2026-08-14T03:54:36Z

🦋 Changeset detected

Latest commit: 1788a35

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 20 packages

Name	Type
@workflow/core	Patch
@workflow/cli	Patch
@workflow/web-shared	Patch
@workflow/world	Patch
@workflow/world-vercel	Patch
@workflow/builders	Patch
@workflow/next	Patch
@workflow/nitro	Patch
@workflow/vitest	Patch
@workflow/web	Patch
workflow	Patch
@workflow/world-testing	Patch
@workflow/world-local	Patch
@workflow/world-postgres	Patch
@workflow/astro	Patch
@workflow/nest	Patch
@workflow/rollup	Patch
@workflow/sveltekit	Patch
@workflow/vite	Patch
@workflow/nuxt	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

vercel · 2026-08-14T03:54:48Z

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated (UTC)
example-nextjs-workflow-turbopack	Ready	Preview	Aug 15, 2026 6:17am
example-nextjs-workflow-webpack	Ready	Preview	Aug 15, 2026 6:17am
example-workflow	Ready	Preview	Aug 15, 2026 6:17am
workbench-astro-workflow	Ready	Preview	Aug 15, 2026 6:17am
workbench-express-workflow	Ready	Preview	Aug 15, 2026 6:17am
workbench-fastify-workflow	Ready	Preview	Aug 15, 2026 6:17am
workbench-hono-workflow	Ready	Preview	Aug 15, 2026 6:17am
workbench-nestjs-workflow	Ready	Preview	Aug 15, 2026 6:17am
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workbench-nuxt-workflow	Ready	Preview	Aug 15, 2026 6:17am
workbench-python-workflow	Ready	Preview	Aug 15, 2026 6:17am
workbench-sveltekit-workflow	Ready	Preview	Aug 15, 2026 6:17am
workbench-tanstack-start-workflow	Ready	Preview	Aug 15, 2026 6:17am
workbench-vite-workflow	Ready	Preview	Aug 15, 2026 6:17am
workflow-docs	Ready	Preview, v0	Aug 15, 2026 6:17am
workflow-swc-playground	Ready	Preview	Aug 15, 2026 6:17am
workflow-tarballs	Ready	Preview	Aug 15, 2026 6:17am
workflow-web	Ready	Preview	Aug 15, 2026 6:17am

github-actions · 2026-08-14T03:54:50Z

🧪 E2E Test Results

✅ All tests passed

🛠 Infra Events (absorbed by the harness)

Platform anomalies the e2e harness detected and worked around (e.g. a run the queue never picked up, replaced by a fresh run). Clustered timestamps indicate a backend blip; a steady drip indicates a platform issue worth escalating.

run-pickup-stall · addTenWorkflow (tanstack-start) · at 06:18:45Z · abandoned wrun_01M0214T6PY8QYMVF37D9Y4AGE

E2E Test Summary

Summary

	Passed	Skipped	Total
✅ ▲ Vercel Production	3321	735	4056
✅ 💻 Local Development	3810	558	4368
✅ 📦 Local Production	3810	558	4368
✅ 🐘 Local Postgres	3810	558	4368
✅ 🪟 Windows	312	0	312
✅ 🌐 Cross-language Conformance	9	128	137
✅ vercel-multi-region	27	0	27
Total	15099	2537	17636

Details by Category

✅ ▲ Vercel Production

App	Passed	Skipped
✅ astro-node	128	28
✅ astro-quickjs	128	28
✅ example-node	128	28
✅ example-quickjs	128	28
✅ express-node	128	28
✅ express-quickjs	128	28
✅ fastify-node	128	28
✅ fastify-quickjs	128	28
✅ hono-node	128	28
✅ hono-quickjs	128	28
✅ nest-node	128	28
✅ nest-quickjs	128	28
✅ nextjs-turbopack-node	153	3
✅ nextjs-webpack-node	153	3
✅ nextjs-webpack-quickjs	153	3
✅ nitro-node	128	28
✅ nitro-quickjs	128	28
✅ nuxt-node	128	28
✅ nuxt-quickjs	128	28
✅ python-node	8	148
✅ sveltekit-node	147	9
✅ sveltekit-quickjs	147	9
✅ tanstack-start-node	128	28
✅ tanstack-start-quickjs	128	28
✅ vite-node	128	28
✅ vite-quickjs	128	28

✅ 💻 Local Development

App	Passed	Skipped
✅ astro-stable-node	130	26
✅ astro-stable-quickjs	130	26
✅ express-stable-node	130	26
✅ express-stable-quickjs	130	26
✅ fastify-stable-node	130	26
✅ fastify-stable-quickjs	130	26
✅ hono-stable-node	130	26
✅ hono-stable-quickjs	130	26
✅ nest-stable-node	130	26
✅ nest-stable-quickjs	130	26
✅ nextjs-turbopack-canary-node	137	19
✅ nextjs-turbopack-canary-quickjs	137	19
✅ nextjs-turbopack-stable-node	156	0
✅ nextjs-turbopack-stable-quickjs	156	0
✅ nextjs-webpack-canary-node	137	19
✅ nextjs-webpack-canary-quickjs	137	19
✅ nextjs-webpack-stable-node	156	0
✅ nextjs-webpack-stable-quickjs	156	0
✅ nitro-stable-node	130	26
✅ nitro-stable-quickjs	130	26
✅ nuxt-stable-node	130	26
✅ nuxt-stable-quickjs	130	26
✅ sveltekit-stable-node	149	7
✅ sveltekit-stable-quickjs	149	7
✅ tanstack-start-node	130	26
✅ tanstack-start-quickjs	130	26
✅ vite-stable-node	130	26
✅ vite-stable-quickjs	130	26

✅ 📦 Local Production

App	Passed	Skipped
✅ astro-stable-node	130	26
✅ astro-stable-quickjs	130	26
✅ express-stable-node	130	26
✅ express-stable-quickjs	130	26
✅ fastify-stable-node	130	26
✅ fastify-stable-quickjs	130	26
✅ hono-stable-node	130	26
✅ hono-stable-quickjs	130	26
✅ nest-stable-node	130	26
✅ nest-stable-quickjs	130	26
✅ nextjs-turbopack-canary-node	137	19
✅ nextjs-turbopack-canary-quickjs	137	19
✅ nextjs-turbopack-stable-node	156	0
✅ nextjs-turbopack-stable-quickjs	156	0
✅ nextjs-webpack-canary-node	137	19
✅ nextjs-webpack-canary-quickjs	137	19
✅ nextjs-webpack-stable-node	156	0
✅ nextjs-webpack-stable-quickjs	156	0
✅ nitro-stable-node	130	26
✅ nitro-stable-quickjs	130	26
✅ nuxt-stable-node	130	26
✅ nuxt-stable-quickjs	130	26
✅ sveltekit-stable-node	149	7
✅ sveltekit-stable-quickjs	149	7
✅ tanstack-start-node	130	26
✅ tanstack-start-quickjs	130	26
✅ vite-stable-node	130	26
✅ vite-stable-quickjs	130	26

✅ 🐘 Local Postgres

App	Passed	Skipped
✅ astro-stable-node	130	26
✅ astro-stable-quickjs	130	26
✅ express-stable-node	130	26
✅ express-stable-quickjs	130	26
✅ fastify-stable-node	130	26
✅ fastify-stable-quickjs	130	26
✅ hono-stable-node	130	26
✅ hono-stable-quickjs	130	26
✅ nest-stable-node	130	26
✅ nest-stable-quickjs	130	26
✅ nextjs-turbopack-canary-node	137	19
✅ nextjs-turbopack-canary-quickjs	137	19
✅ nextjs-turbopack-stable-node	156	0
✅ nextjs-turbopack-stable-quickjs	156	0
✅ nextjs-webpack-canary-node	137	19
✅ nextjs-webpack-canary-quickjs	137	19
✅ nextjs-webpack-stable-node	156	0
✅ nextjs-webpack-stable-quickjs	156	0
✅ nitro-stable-node	130	26
✅ nitro-stable-quickjs	130	26
✅ nuxt-stable-node	130	26
✅ nuxt-stable-quickjs	130	26
✅ sveltekit-stable-node	149	7
✅ sveltekit-stable-quickjs	149	7
✅ tanstack-start-node	130	26
✅ tanstack-start-quickjs	130	26
✅ vite-stable-node	130	26
✅ vite-stable-quickjs	130	26

✅ 🪟 Windows

App	Passed	Failed	Skipped
✅ nextjs-turbopack-node	156	0	0
✅ nextjs-turbopack-quickjs	156	0	0

✅ 🌐 Cross-language Conformance

App	Passed	Failed	Skipped
✅ python	9	0	128

✅ vercel-multi-region

App	Passed	Failed	Skipped
✅ nextjs-turbopack	27	0	0

📋 View full workflow run

github-actions · 2026-08-14T03:57:14Z

Sim World

Simulated world deterministic testing for races. Traces

🟠 Mint-ordered log — 3 fail of 41 total

log=mint-ordered · fence=per-spec

scenario	outcome	events	virt	replay	violations
✅ `smoke-no-steps`	completed	3	0ms	ok	0
✅ `smoke-one-step`	completed	6	0ms	ok	0
✅ `hook-at-step-started`	completed	12	0ms	ok	0
✅ `hook-at-step-completed`	completed	12	0ms	ok	0
✅ `hook-at-hook-created`	completed	12	0ms	ok	0
✅ `deadline-hook-wins`	completed	7	1.0h	ok	0
✅ `deadline-expires`	completed	7	1.0h	ok	0
✅ `long-sleep`	completed	11	30.0d	ok	0
✅ `hook-never-arrives`	stalled	3	0ms	skipped	0
✅ `step-retries-twice`	completed	10	2.0s	ok	0
✅ `parallel-steps`	completed	9	0ms	ok	0
✅ `hook-on-execution-state`	completed	12	0ms	ok	0
✅ `peek-hook-before-branch`	completed	12	0ms	ok	0
✅ `peek-hook-after-branch`	completed	12	0ms	ok	0
✅ `peek-hook-at-registration`	completed	12	0ms	ok	0
✅ `race-hook-before-probe`	completed	12	0ms	ok	0
✅ `race-hook-after-probe`	completed	12	0ms	ok	0
✅ `race-duplicate-delivery`	completed	13	0ms	ok	0
✅ `attr-hook-before-step`	completed	11	0ms	ok	0
✅ `attr-hook-after-step`	completed	11	0ms	ok	0
✅ `attr-from-step-body`	completed	13	0ms	ok	0
✅ `fork-hook-after-timeout`	completed	14	1.0m	ok	0
✅ `fork-hook-before-timeout`	completed	14	1.0m	ok	0
✅ `count-hook-after-timeout`	completed	17	1.0m	ok	0
✅ `count-hook-before-timeout`	completed	20	1.0m	ok	0
✅ `stale-read-step-count-fork`	completed	20	1.0m	ok	0
✅ `stale-read-equal-step-counts`	completed	14	1.0m	ok	0
✅ `step-vs-step-fork`	completed	12	0ms	ok	0
✅ `step-vs-step-fork-fenced`	completed	12	0ms	ok	0
✅ `fence-catches-benign-direction`	completed	12	5ms	ok	0
❌ `in-flight-before-decision`	failed	9	1.0m	MISMATCH	1
❌ `in-flight-before-decision-counted`	failed	9	1.0m	MISMATCH	1
❌ `in-flight-after-decision`	failed	9	1.0m	MISMATCH	1
✅ `stale-read-step-count-fork-fenced`	completed	20	1.0m	ok	0
✅ `fork-hook-wins`	completed	13	1.0m	ok	0
✅ `fork-timeout-wins`	completed	13	1.0m	ok	0
✅ `unclaimed-payload-under-fork`	completed	17	1.0m	ok	0
✅ `claimed-payload-under-fork`	completed	17	1.0m	ok	0
✅ `writers-independent-step-bodies`	completed	12	0ms	ok	0
✅ `writers-scripted-tempo`	completed	12	0ms	ok	0
✅ `cancel-mid-step`	cancelled	7	0ms	skipped	0

Full trace: world-sim-mint.txt

🟢 Append-only log — 0 fail of 41 total

log=append-only · fence=per-spec

scenario	outcome	events	virt	replay
✅ `smoke-no-steps`	completed	3	0ms	ok
✅ `smoke-one-step`	completed	6	0ms	ok
✅ `hook-at-step-started`	completed	12	0ms	ok
✅ `hook-at-step-completed`	completed	12	0ms	ok
✅ `hook-at-hook-created`	completed	12	0ms	ok
✅ `deadline-hook-wins`	completed	7	1.0h	ok
✅ `deadline-expires`	completed	7	1.0h	ok
✅ `long-sleep`	completed	11	30.0d	ok
✅ `hook-never-arrives`	stalled	3	0ms	skipped
✅ `step-retries-twice`	completed	10	2.0s	ok
✅ `parallel-steps`	completed	9	0ms	ok
✅ `hook-on-execution-state`	completed	12	0ms	ok
✅ `peek-hook-before-branch`	completed	12	0ms	ok
✅ `peek-hook-after-branch`	completed	12	0ms	ok
✅ `peek-hook-at-registration`	completed	12	0ms	ok
✅ `race-hook-before-probe`	completed	12	0ms	ok
✅ `race-hook-after-probe`	completed	12	0ms	ok
✅ `race-duplicate-delivery`	completed	13	0ms	ok
✅ `attr-hook-before-step`	completed	11	0ms	ok
✅ `attr-hook-after-step`	completed	11	0ms	ok
✅ `attr-from-step-body`	completed	13	0ms	ok
✅ `fork-hook-after-timeout`	completed	14	1.0m	ok
✅ `fork-hook-before-timeout`	completed	14	1.0m	ok
✅ `count-hook-after-timeout`	completed	17	1.0m	ok
✅ `count-hook-before-timeout`	completed	20	1.0m	ok
✅ `stale-read-step-count-fork`	completed	20	1.0m	ok
✅ `stale-read-equal-step-counts`	completed	14	1.0m	ok
✅ `step-vs-step-fork`	completed	12	0ms	ok
✅ `step-vs-step-fork-fenced`	completed	12	0ms	ok
✅ `fence-catches-benign-direction`	completed	12	5ms	ok
✅ `in-flight-before-decision`	completed	17	1.0m	ok
✅ `in-flight-before-decision-counted`	completed	17	1.0m	ok
✅ `in-flight-after-decision`	completed	19	2.0m	ok
✅ `stale-read-step-count-fork-fenced`	completed	20	1.0m	ok
✅ `fork-hook-wins`	completed	13	1.0m	ok
✅ `fork-timeout-wins`	completed	13	1.0m	ok
✅ `unclaimed-payload-under-fork`	completed	17	1.0m	ok
✅ `claimed-payload-under-fork`	completed	17	1.0m	ok
✅ `writers-independent-step-bodies`	completed	12	0ms	ok
✅ `writers-scripted-tempo`	completed	12	0ms	ok
✅ `cancel-mid-step`	cancelled	7	0ms	skipped

Full trace: world-sim-append-only.txt

github-actions · 2026-08-14T03:57:22Z

📊 Workflow Benchmarks

commit 1788a35 · Sat, 15 Aug 2026 06:38:19 GMT · run logs

Backend: vercel · app: nextjs-turbopack

Metric	Scenario	Best (ms)	P75 (ms)	P90 (ms)	P99 (ms)	Samples
TTFS	step	270 (+19%) 🔻	1326 🔴 (+16%) 🔻	1339 🔴 (+11%)	1366 🔴 (+0.8%)	30
TTFS	stream	1305 (+455%) 🔻	1336 🔴 (+12%)	1355 🔴 (+7.0%)	1383 🔴 (+2.4%)	30
TTFS	hook + stream	1539 (+270%) 🔻	1624 🔴 (+14%)	1647 🔴 (+13%)	1979 🔴 (+28%) 🔻	30
Fan-out TTFS	Promise.all(100 steps)	1017 (-23%) 💚	1288 (-50%) 💚	2706 (±0%)	2874 (-10%)	10
Fan-out TTLS	Promise.all(100 steps)	9854 (-9.3%)	14097 (-87%) 💚	16071 (-91%) 💚	18420 (-90%) 💚	10
STSO	1020 steps (inline)	113 (-27%) 💚	386 (-22%) 💚	420 (-25%) 💚	486 (-38%) 💚	1019
WO	1020 steps	333737 (-20%) 💚	333737 (-20%) 💚	333737 (-20%) 💚	333737 (-20%) 💚	1
CRTT	first chunk (pooled)	79 (-19%) 💚	105 (-32%) 💚	108 (-54%) 💚	160 (-45%) 💚	28

Streams

Scenario	wr c/s	rd c/s	wr KiB/s	rd KiB/s	CRTT 1st	p75	p90	p99	CDV max	iters
paced control (100/s, 60B)	100 (±0%)	101 (-1%)	5 (±0%)	5.1 (±0%)	95.5 (-29%)	132 (-56%)	348 (-66%)	950 (-36%)	113 (-46%)	10
size sweep (100/s, 160B-12KB)	100 (±0%)	100 (+1%)	334 (±0%)	334 (+1%)	105 (-9%)	134 (-61%)	173 (-77%)	741 (-41%)	149 (-52%)	10
replay gateway-gpt-5.4-nano-2000t (1x)	89.2 (±0%)	89.3 (±0%)	16.2 (±0%)	16.2 (-1%)	94 (-6%)	114 (-19%)	151 (-22%)	330 (-62%)	228 (-37%)	3
replay eve-gpt-5.6-sol-2000t (1x)	54.7 (±0%)	54.8 (±0%)	355 (±0%)	356 (±0%)	89 (-47%)	131 (-26%)	296 (-65%)	805 (-78%)	475 (-76%)	2
replay eve-gpt-5.6-sol-2000t (2x)	109 (±0%)	110 (+1%)	710 (±0%)	712 (+1%)	92 (-27%)	5237 (+1725%)	6735 (+899%)	7894 (+305%)	2877 (+185%)	3

📈 STSO distribution vs main (inline / queue-hop histograms)

1020 steps (inline)

Cumulative STSO time: main 413585ms → this run 333544ms (Δ -80041ms, -19%)

  100-150 ms  ░┃                        main   0  this  20   +20
  150-200 ms  ███┃███                   main  69  this  41   -28
  200-250 ms  ████████┃█                main 102  this  92   -10
  250-300 ms  █████░░░░░░░░░░░░░░░░░░┃  main  52  this 236  +184
  300-350 ms  ████████████████░░░░░░┃   main 154  this 229   +75
  350-400 ms  ████████████████████┃     main 193  this 209   +16
  400-450 ms  ████████░░░░░░░┃          main  80  this 158   +78
  450-500 ms  ██┃█████████              main 118  this  25   -93
  500-550 ms  ┃█████████████            main 135  this   3  -132
  550-600 ms  ┃█████                    main  61  this   2   -59
  600-650 ms  ┃█                        main  19  this   0   -19
  650-700 ms  ┃                         main  13  this   3   -10
  700-750 ms  ┃                         main   9  this   0    -9
  750-800 ms  ┃                         main   4  this   0    -4
  800-850 ms  ┃                         main   3  this   0    -3
  850-900 ms  ┃                         main   2  this   0    -2
 950-1000 ms  ┃                         main   1  this   0    -1
1200-1250 ms  ┃                         main   1  this   0    -1
2000-2050 ms  ┃                         main   0  this   1    +1
3150-3200 ms  ┃                         main   1  this   0    -1
3600-3650 ms  ┃                         main   1  this   0    -1
3650-3700 ms  ┃                         main   1  this   0    -1

📈 CRTT drill-down vs main (RTT distributions & profiles)

variant  RTT 1ms→5s+              avg        p50           p90           p99     n
control  ······██▁▁···   125.8 (-48%)  99 (-35%)    348 (-66%)    950 (-36%)  3000
sweep    ·····▁██▁▁···   119.4 (-43%)  97 (-26%)    173 (-77%)    741 (-41%)  3000
gw 1x    ·····▁█▆▁····   101.7 (-22%)  94 (-18%)    151 (-22%)    330 (-62%)  5295
eve 1x   ·····▁█▅▂▁▁··   119.1 (-53%)  89 (-23%)    296 (-65%)    805 (-78%)  5186
eve 2x   ·····▁▃█▃▁▁▂▂  991.6 (+268%)  163 (-6%)  6735 (+899%)  7894 (+305%)  7779

RTT over stream progress (avg per tenth of stream, bars scaled min→max):

control  ▂▂▄▇█▅▂▂▁▁  103–170ms
sweep    ▃▁▃▂▃▆█▃██  102–137ms
gw 1x    █▄▅▆▅▂▅▁▄▃  88–118ms
eve 1x   ▂▁▂▁▁▁▄▅█▂  85–221ms
eve 2x   ▂▃▁▁▁▄█▇▆▄  137–2424ms

RTT by chunk size (avg per log size bin, ~160B → ~12KB serialized, bars scaled min→max):

sweep  ▇█▆▄▄▁▃  117–122ms

Delivery jitter over stream progress (avg positive CDV per tenth of stream, bars scaled min→max):

control  ▁▄▁█▁▁▁▄▁▂  32–45ms
sweep    ▁▃▃▂▄▆▁▂█▁  39–60ms
gw 1x    ▇▅█▇█▃▄▁▅▇  25–34ms
eve 1x   ▄▁▂▂▃▂▅█▆▄  20–36ms
eve 2x   ▄▁▁▂▂█▂▁▂▂  24–93ms

📜 Previous results (4)

`87dad38`

Fri, 14 Aug 2026 23:14:47 GMT · run logs

vercel / nextjs-turbopack

Metric	Scenario	Best (ms)	P75 (ms)	P90 (ms)	P99 (ms)	Samples
TTFS	step	217 (-7.3%)	1402 🔴 (+23%) 🔻	1432 🔴 (+20%) 🔻	1594 🔴 (-10%)	30
TTFS	stream	274 (+20%) 🔻	1417 🔴 (+30%) 🔻	1440 🔴 (+25%) 🔻	1687 🔴 (+11%)	30
TTFS	hook + stream	397 (-2.7%)	1622 🔴 (+18%) 🔻	1649 🔴 (+18%) 🔻	1844 🔴 (+19%) 🔻	30
Fan-out TTFS	Promise.all(100 steps)	9537 (+1.4%)	10710 (+2.6%)	10992 (-3.4%)	11688 (-68%) 💚	10
Fan-out TTLS	Promise.all(100 steps)	18271 (-4.3%)	20021 (-11%)	20035 (-13%)	22124 (-52%) 💚	10
STSO	1020 steps (inline)	143 (±0%)	495 (+0.8%)	538 (-1.1%)	709 (±0%)	1018
STSO	1020 steps (queue-hop)	3183 (+8.8%)	3183 (+8.8%)	3183 (+8.8%)	3183 (+8.8%)	1
WO	1020 steps	458646 (+3.5%)	458646 (+3.5%)	458646 (+3.5%)	458646 (+3.5%)	1

`d626964`

Fri, 14 Aug 2026 21:49:41 GMT · run logs

vercel / nextjs-turbopack

Metric	Scenario	Best (ms)	P75 (ms)	P90 (ms)	P99 (ms)	Samples
TTFS	step	291 (-58%) 💚	1360 🔴 (+22%) 🔻	1378 🔴 (+20%) 🔻	1428 🔴 (-7.1%)	30
TTFS	stream	204 (-80%) 💚	1356 🔴 (+20%) 🔻	1375 🔴 (+20%) 🔻	1535 🔴 (+25%) 🔻	30
TTFS	hook + stream	1579 (+28%) 🔻	1681 🔴 (+23%) 🔻	1714 🔴 (+23%) 🔻	1744 🔴 (-6.8%)	30
Fan-out TTFS	Promise.all(100 steps)	8927 (-3.7%)	9416 (-8.9%)	9936 (-4.2%)	14652 (+34%) 🔻	10
Fan-out TTLS	Promise.all(100 steps)	17930 (-1.3%)	22236 (+8.3%)	24688 (+14%)	24822 (±0%)	10
STSO	1020 steps (inline)	120 (-22%) 💚	394 (-20%) 💚	430 (-21%) 💚	556 (-26%) 💚	1018
STSO	1020 steps (queue-hop)	2176 (-29%) 💚	2176 (-29%) 💚	2176 (-29%) 💚	2176 (-29%) 💚	1
WO	1020 steps	354090 (-22%) 💚	354090 (-22%) 💚	354090 (-22%) 💚	354090 (-22%) 💚	1
SL	stream latency	82	104 🔴	113 🔴	155 🔴	30
SO	stream overhead (text)	104	161	198	429	30
SO	stream overhead (structured)	100	151	250	3628 🔴	30

`5b5b8cf`

Fri, 14 Aug 2026 20:27:31 GMT · run logs

vercel / nextjs-turbopack

Metric	Scenario	Best (ms)	P75 (ms)	P90 (ms)	P99 (ms)	Samples
TTFS	step	258 (+17%) 🔻	1351 🔴 (+21%) 🔻	1480 🔴 (+25%) 🔻	1663 🔴 (+38%) 🔻	30
TTFS	stream	279 (+17%) 🔻	1349 🔴 (+21%) 🔻	1356 🔴 (+19%) 🔻	1529 🔴 (+23%) 🔻	30
TTFS	hook + stream	1546 (+212%) 🔻	1629 🔴 (+23%) 🔻	1661 🔴 (+20%) 🔻	1917 🔴 (+37%) 🔻	30
Fan-out TTFS	Promise.all(100 steps)	9087 (±0%)	13281 (+32%) 🔻	16042 (+57%) 🔻	16563 (+60%) 🔻	10
Fan-out TTLS	Promise.all(100 steps)	18220 (+3.2%)	28589 (+53%) 🔻	31944 (+70%) 🔻	35491 (+78%) 🔻	10
STSO	1020 steps (inline)	117 (-17%) 💚	393 (+86%) 🔻	429 (+80%) 🔻	507 (+40%) 🔻	1018
STSO	1020 steps (queue-hop)	2149	2149	2149	2149	1
WO	1020 steps	343088 (+69%) 🔻	343088 (+69%) 🔻	343088 (+69%) 🔻	343088 (+69%) 🔻	1
SL	stream latency	82 (-15%)	112 🔴 (-30%) 💚	129 🔴 (-32%) 💚	181 🔴 (-51%) 💚	30
SO	stream overhead (text)	102 (-32%) 💚	212 (-15%)	366 (-43%) 💚	588 (-67%) 💚	30
SO	stream overhead (structured)	101 (-34%) 💚	170 (-45%) 💚	287 (-23%) 💚	889 (+30%) 🔻	30

`1e92acf`

Fri, 14 Aug 2026 04:18:27 GMT · run logs

vercel / nextjs-turbopack

Metric	Scenario	Best (ms)	P75 (ms)	P90 (ms)	P99 (ms)	Samples
TTFS	step	1169 (+207%) 🔻	1296 🔴 (+16%) 🔻	1331 🔴 (+17%) 🔻	1774 🔴 (+16%) 🔻	30
TTFS	stream	1153 (+15%)	1222 🔴 (+16%) 🔻	1256 🔴 (+17%) 🔻	1400 🔴 (+26%) 🔻	30
TTFS	hook + stream	1430 (+12%)	1532 🔴 (+11%)	1594 🔴 (+12%)	1926 🔴 (+19%) 🔻	30
Fan-out TTFS	Promise.all(100 steps)	8855 (-0.7%)	9094 (-8.6%)	9200 (-8.7%)	9712 (-28%) 💚	10
Fan-out TTLS	Promise.all(100 steps)	17330 (-1.9%)	17736 (-6.0%)	17812 (-6.3%)	19802 (-16%) 💚	10
STSO	1020 steps (inline)	119 (-3.3%)	163 (-15%)	180 (-21%) 💚	294 (-49%) 💚	1019
WO	1020 steps	162311 (-17%) 💚	162311 (-17%) 💚	162311 (-17%) 💚	162311 (-17%) 💚	1
SL	stream latency	85 (+7.6%)	110 🔴 (±0%)	134 🔴 (+3.9%)	305 🔴 (-11%)	30
SO	stream overhead (text)	99 (-11%)	191 (+6.1%)	212 (+2.9%)	608 (+0.7%)	30
SO	stream overhead (structured)	95 (-1.0%)	167 (+7.1%)	254 (+52%) 🔻	638 (+251%) 🔻	30

ℹ️ Metric definitions & methodology

_{Streams: writer/reader sustained rates (steady window, 10% trimmed each side), first-chunk RTT (the stream-open path, before any buffering/backpressure), CRTT percentiles, and worst delivery stall (CDV max). Cells are medians across iterations; per-run values in the artifacts. No 🔴/🟢 marks until targets attach.}

_{The collapsed STSO distribution section above buckets every step gap, split inline (same warm process — pure framework overhead) vs queue-hop (fresh process — dispatch, reinit, replay). █ = main, ┃ = this run, ░ = fill.}

_{The collapsed CRTT drill-down: per-variant RTT histograms (fixed log bins, · = empty) and mean RTT/positive-CDV profile lines over stream progress and chunk size. Histograms, avgs, and profiles merge exactly across runs; p50–p99 are percentile-of-percentiles. Per-index rows live in the artifacts.}

_{Best/P75/P90/P99 deltas compare against the most recent benchmark run on main at the time of this run. 🔻 flags a delta worse than +15%, 💚 one better than −15%.}

_{Metrics — TTFS: time to first step body (in-deployment start() → first step body) · Fan-out TTFS: fan-out time to first step (in-deployment start() → first of the parallel step bodies to complete) · Fan-out TTLS: fan-out time to last step (in-deployment start() → last of the parallel step bodies to complete, i.e. when the Promise.all resolves) · STSO: step-to-step overhead (gap between consecutive step bodies) · WO: workflow overhead (whole-run time outside step bodies, in-deployment anchored) · CRTT: chunk round-trip time (per-chunk write → read latency, one clock domain: deployment → stream backend → same deployment) · CDV: chunk delay variation / delivery jitter (inter-arrival gap minus inter-write gap per seq-adjacent pair; skew-free; the row is each run's MAX positive value, so one stall moves it)}

_{Scenarios — step: one trivial no-op step, no stream; no hooks, so the run stays in turbo mode (in-process fast path) · stream: one streaming step; no hooks, so the run stays in turbo mode (in-process fast path) · hook + stream: registers a hook before one step, which exits turbo mode (dispatch path) · 1020 steps: 1020 trivial sequential steps; STSO is measured between consecutive steps in the given step ranges, and WO is the whole-run overhead outside step bodies · Promise.all(100 steps): 100 trivial no-op steps started together in a single Promise.all; Fan-out TTFS is the first of them to complete and Fan-out TTLS the last, both from the in-deployment clientStart, so their gap is the spread the runtime adds across the fan-out · paced control (100/s, 60B): the control: 300 tiny (~60B) deltas metronome-paced at 100/s — zero workload structure, so it reads the transport floor and flush cadence, and disambiguates transport-wide vs workload-specific when a replay row moves · size sweep (100/s, 160B-12KB): same pacing as the control with deltas padded in rotation across seven log-spaced sizes (~160B–12KB) — rotation decouples size from stream position, so it isolates whether chunk size causes latency · replay gateway-gpt-5.4-nano-2000t (1x): raw provider SSE cadence captured at the AI gateway boundary (gpt-5.4-nano, the most popular gateway model; per-token deltas p50 208B = the modal production chunk size), replayed exactly as measured — the typical customer's workload; its CDV is the typical customer's real delivery jitter · replay eve-gpt-5.6-sol-2000t (1x): a captured eve turn (gpt-5.6-sol, the most-used demanding eve model; ~2000 output tokens = production p50 turn length) replayed exactly as measured — eve's envelope protocol re-ships the cumulative message so sizes ramp 142B→13KB; the demanding outlier tenant's reality · replay eve-gpt-5.6-sol-2000t (2x): the same eve capture at 2x — the headroom/stress row; real fast-tier models emit the same chunk sizes at proportionally higher rate, so time compression is a faithful speed model · first chunk (pooled): every run's seq-0 RTT pooled across all stream scenarios — the first chunk precedes any workload differentiation, so pooling samples one shared stream-open path with exact percentiles}

_{Replay cadences (semantic sha256) — eve-gpt-5.6-sol-2000t eaf22f5946e7c61f3c65c7006d550df180cfabd4e706254a09f22aec0cfb420d · gateway-gpt-5.4-nano-2000t 6f24ac518b6b83ff1d0e85a5fe78230db192716d66a7fc6b2fe022752001d041}

_{🔴 marks a percentile over its target (within target is left unmarked). Targets (p75/p90/p99, ms) — TTFS 200/300/600}

_{All timestamps are deployment-side; runs are triggered in-deployment, so the CI runner and api.vercel.com sit outside every measured window. TTFS = start() → first step body (includes dispatch + any cold start); Fan-out TTFS/TTLS = first/last step completion of one Promise.all from the same anchor (the gap is the runtime’s fan-out spread); STSO/WO between step bodies; CRTT inside the workflow (excludes the api.vercel.com read path).}

_{Cold starts stay in the numbers (real bursty-workload latency, inflates P75+); Best is the warm floor.}

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NathanColosimo changed the title ~~Decode replay payloads synchronously~~ [core] Decode replay payloads synchronously Aug 14, 2026

This was referenced Aug 14, 2026

[world-vercel] Resume partial replay streams after validated events #3546

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[core] Prepare replay payloads as event frames arrive #3548

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[core] Trace fresh workflow replay phases #3523

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NathanColosimo added 14 commits August 14, 2026 23:08

Decode replay payloads synchronously

5142029

[core] Simplify synchronous replay decoding

89196a3

[core] Simplify synchronous replay payload APIs

d1f9eed

[core] Deepen payload codec boundaries

40ce738

[core] Consolidate payload codecs

7b57d4c

[core] Avoid native codec result copies

022296d

[core] Reuse loaded encryption helpers

5ec2017

[core] Fix legacy replay payload tagging

998f7fe

[core] Consolidate replay decryption

385d9a2

[core] Consolidate replay preparation types

dca9e6f

[cli] Remove encryption resolver wrapper type

b952401

[cli] Use the decryption capability type directly

4b86f36

[cli] Sort hydration imports

ca4f3cd

refactor(serialization): centralize format handling

1788a35

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[core] Decode replay payloads synchronously - #3547

[core] Decode replay payloads synchronously#3547
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Summary

Compatibility note

Local latency check on Node 22.18

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🧪 E2E Test Results

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