Turbopack: avoid chunk_item_id task and use selective cell access instead #88411

sokra · 2026-01-12T09:23:43Z

What?

Use selection reads for module id to avoid functions

sokra · 2026-01-12T09:23:58Z

nextjs-bot · 2026-01-12T09:24:09Z

Allow CI Workflow Run

approve CI run for commit: 38833eb

Note: this should only be enabled once the PR is ready to go and can only be enabled by a maintainer

turbopack/crates/turbopack-core/src/chunk/chunk_id_strategy.rs

nextjs-bot · 2026-01-12T09:51:25Z

Stats from current PR

✅ No significant changes detected

📊 All Metrics

📖 Metrics Glossary

Dev Server Metrics:

Listen = TCP port starts accepting connections
First Request = HTTP server returns successful response
Cold = Fresh build (no cache)
Warm = With cached build artifacts

Build Metrics:

Fresh = Clean build (no .next directory)
Cached = With existing .next directory

Change Thresholds:

Time: Changes < 50ms AND < 10%, OR < 2% are insignificant
Size: Changes < 1KB AND < 1% are insignificant
All other changes are flagged to catch regressions

⚡ Dev Server

Metric	Canary	PR	Change	Trend
Cold (Listen)	505ms	507ms	✓	▁▁▁█▁
Cold (Ready in log)	462ms	460ms	✓	▁▅▇▅▆
Cold (First Request)	901ms	909ms	✓	▁▇█▃█
Warm (Listen)	505ms	505ms	✓	▁▁▁▅▁
Warm (Ready in log)	460ms	459ms	✓	▁▁▁▅▁
Warm (First Request)	334ms	354ms	✓	▁▁▁▆▅

📦 Dev Server (Webpack) (Legacy)

📦 Dev Server (Webpack)

Metric	Canary	PR	Change	Trend
Cold (Listen)	456ms	456ms	✓	▁▁▁▁▁
Cold (Ready in log)	440ms	440ms	✓	▅▇▁▁▇
Cold (First Request)	1.822s	1.809s	✓	▃▄▁▁▅
Warm (Listen)	456ms	456ms	✓	▁▁▁▁▁
Warm (Ready in log)	439ms	441ms	✓	▅▅▁▁▅
Warm (First Request)	1.817s	1.826s	✓	▄▄▁▁▅

⚡ Production Builds

Metric	Canary	PR	Change	Trend
Fresh Build	4.752s	4.777s	✓	▂▁▁▇▁
Cached Build	4.758s	4.767s	✓	▂▁▂▇▁

📦 Production Builds (Webpack) (Legacy)

📦 Production Builds (Webpack)

Metric	Canary	PR	Change	Trend
Fresh Build	13.933s	13.908s	✓	▁▁▁▁▃
Cached Build	14.034s	14.031s	✓	▁▁▂▁▃
node_modules Size	458 MB	458 MB	✓	▁▁▁▁▁

📦 Bundle Sizes

Bundle Sizes

⚡ Turbopack

Client

Main Bundles: **430 kB** → **430 kB** ✅ -81 B

82 files with content-based hashes (individual files not comparable between builds)

Server

Middleware

	Canary	PR	Change
middleware-b..fest.js gzip	790 B	785 B	✓
Total	790 B	785 B	✅ -5 B

Build Details

Build Manifests

	Canary	PR	Change
_buildManifest.js gzip	449 B	450 B	✓
Total	449 B	450 B	⚠️ +1 B

📦 Webpack

Client

Main Bundles

	Canary	PR	Change
2086.HASH.js gzip	169 B	N/A	-
2161-HASH.js gzip	5.41 kB	N/A	-
2747-HASH.js gzip	4.48 kB	N/A	-
4322-HASH.js gzip	52.3 kB	N/A	-
ec793fe8-HASH.js gzip	62.3 kB	N/A	-
framework-HASH.js gzip	59.8 kB	59.8 kB	✓
main-app-HASH.js gzip	251 B	254 B	🔴 +3 B (+1%)
main-HASH.js gzip	38.6 kB	38.9 kB	✓
webpack-HASH.js gzip	1.68 kB	1.68 kB	✓
1596.HASH.js gzip	N/A	169 B	-
2658-HASH.js gzip	N/A	51.9 kB	-
6349-HASH.js gzip	N/A	4.46 kB	-
7019-HASH.js gzip	N/A	5.43 kB	-
b17a3386-HASH.js gzip	N/A	62.3 kB	-
Total	225 kB	225 kB	✅ -10 B

Polyfills

	Canary	PR	Change
polyfills-HASH.js gzip	39.4 kB	39.4 kB	✓
Total	39.4 kB	39.4 kB	✓

Pages

	Canary	PR	Change
_app-HASH.js gzip	194 B	193 B	✓
_error-HASH.js gzip	182 B	182 B	✓
css-HASH.js gzip	336 B	335 B	✓
dynamic-HASH.js gzip	1.8 kB	1.8 kB	✓
edge-ssr-HASH.js gzip	256 B	256 B	✓
head-HASH.js gzip	352 B	349 B	✓
hooks-HASH.js gzip	385 B	384 B	✓
image-HASH.js gzip	580 B	580 B	✓
index-HASH.js gzip	259 B	258 B	✓
link-HASH.js gzip	2.5 kB	2.51 kB	✓
routerDirect..HASH.js gzip	319 B	317 B	✓
script-HASH.js gzip	385 B	387 B	✓
withRouter-HASH.js gzip	316 B	315 B	✓
1afbb74e6ecf..834.css gzip	106 B	106 B	✓
Total	7.97 kB	7.96 kB	✅ -8 B

Server

Edge SSR

	Canary	PR	Change
edge-ssr.js gzip	125 kB	125 kB	✓
page.js gzip	242 kB	237 kB	🟢 4.88 kB (-2%)
Total	366 kB	361 kB	✅ -4.86 kB

Middleware

	Canary	PR	Change
middleware-b..fest.js gzip	654 B	653 B	✓
middleware-r..fest.js gzip	155 B	156 B	✓
middleware.js gzip	33 kB	33.3 kB	✓
edge-runtime..pack.js gzip	842 B	842 B	✓
Total	34.7 kB	34.9 kB	⚠️ +281 B

Build Details

Build Manifests

	Canary	PR	Change
_buildManifest.js gzip	738 B	738 B	✓
Total	738 B	738 B	✓

Build Cache

	Canary	PR	Change
0.pack gzip	3.66 MB	3.66 MB	🔴 +4.81 kB (+0%)
index.pack gzip	99.4 kB	99.4 kB	✓
index.pack.old gzip	98.3 kB	99.8 kB	🔴 +1.49 kB (+2%)
Total	3.86 MB	3.86 MB	⚠️ +6.28 kB

🔄 Shared (bundler-independent)

Runtimes

	Canary	PR	Change
app-page-exp...dev.js gzip	303 kB	303 kB	✓
app-page-exp..prod.js gzip	158 kB	158 kB	✓
app-page-tur...dev.js gzip	303 kB	303 kB	✓
app-page-tur..prod.js gzip	158 kB	158 kB	✓
app-page-tur...dev.js gzip	300 kB	300 kB	✓
app-page-tur..prod.js gzip	156 kB	156 kB	✓
app-page.run...dev.js gzip	300 kB	300 kB	✓
app-page.run..prod.js gzip	156 kB	156 kB	✓
app-route-ex...dev.js gzip	68.8 kB	68.8 kB	✓
app-route-ex..prod.js gzip	47.6 kB	47.6 kB	✓
app-route-tu...dev.js gzip	68.8 kB	68.8 kB	✓
app-route-tu..prod.js gzip	47.6 kB	47.6 kB	✓
app-route-tu...dev.js gzip	68.4 kB	68.4 kB	✓
app-route-tu..prod.js gzip	47.4 kB	47.4 kB	✓
app-route.ru...dev.js gzip	68.4 kB	68.4 kB	✓
app-route.ru..prod.js gzip	47.3 kB	47.3 kB	✓
dist_client_...dev.js gzip	324 B	324 B	✓
dist_client_...dev.js gzip	326 B	326 B	✓
dist_client_...dev.js gzip	318 B	318 B	✓
dist_client_...dev.js gzip	317 B	317 B	✓
pages-api-tu...dev.js gzip	41.2 kB	41.2 kB	✓
pages-api-tu..prod.js gzip	31.3 kB	31.3 kB	✓
pages-api.ru...dev.js gzip	41.1 kB	41.1 kB	✓
pages-api.ru..prod.js gzip	31.2 kB	31.2 kB	✓
pages-turbo....dev.js gzip	50.8 kB	50.8 kB	✓
pages-turbo...prod.js gzip	38.2 kB	38.2 kB	✓
pages.runtim...dev.js gzip	50.7 kB	50.7 kB	✓
pages.runtim..prod.js gzip	38.2 kB	38.2 kB	✓
server.runti..prod.js gzip	62.2 kB	62.2 kB	✓
Total	2.69 MB	2.69 MB	✅ -4 B

codspeed-hq · 2026-01-13T15:51:02Z

Merging this PR will not alter performance

✅ 17 untouched benchmarks
⏩ 3 skipped benchmarks¹

_{Comparing sokra/chunk-item-id-selective (c2e1c25) with canary (dd39efc)}

3 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

nextjs-bot · 2026-01-13T15:52:35Z

Tests Passed

…tead

graphite-app · 2026-01-16T10:10:57Z

Merge activity

Jan 16, 10:10 AM UTC: Graphite rebased this pull request, because this pull request is set to merge when ready.
Jan 16, 12:07 PM UTC: @sokra merged this pull request with Graphite.

…tead (#88411) ### What? Use selection reads for module id to avoid functions

sokra mentioned this pull request Jan 12, 2026

Turbopack: parallelize making dependent tasks dirty #86755

Merged

nextjs-bot added created-by: Turbopack team PRs by the Turbopack team. Turbopack Related to Turbopack with Next.js. labels Jan 12, 2026

This was referenced Jan 12, 2026

Turbopack: Consistency for compute_async_module_info #88409

Merged

Turbopack: follow tracing spans through aggregation update queue #88410

Merged

vercel bot reviewed Jan 12, 2026

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turbopack/crates/turbopack-core/src/chunk/chunk_id_strategy.rs Outdated Show resolved Hide resolved

sokra force-pushed the sokra/chunk-item-id-selective branch from 38833eb to df2c985 Compare January 13, 2026 15:43

sokra force-pushed the sokra/aggregation-update-tracing branch from 9dabe82 to ba27300 Compare January 13, 2026 15:43

sokra mentioned this pull request Jan 13, 2026

Turbopack: refactor data storage to avoid reverse task cache #88492

Merged

sokra force-pushed the sokra/aggregation-update-tracing branch from ba27300 to c557e1c Compare January 13, 2026 16:40

sokra force-pushed the sokra/chunk-item-id-selective branch from df2c985 to 1bb9198 Compare January 13, 2026 16:40

sokra force-pushed the sokra/aggregation-update-tracing branch from c557e1c to 4173f77 Compare January 13, 2026 20:26

sokra force-pushed the sokra/chunk-item-id-selective branch from 1bb9198 to 4aedf59 Compare January 13, 2026 20:26

sokra marked this pull request as ready for review January 13, 2026 23:38

sokra requested a review from mischnic January 13, 2026 23:38

sokra force-pushed the sokra/aggregation-update-tracing branch from 229bf89 to d3d174b Compare January 15, 2026 18:37

sokra force-pushed the sokra/chunk-item-id-selective branch from 93ba0cc to a520ee5 Compare January 15, 2026 18:37

sokra force-pushed the sokra/aggregation-update-tracing branch from d3d174b to 2c0d6b2 Compare January 15, 2026 19:20

sokra force-pushed the sokra/chunk-item-id-selective branch from a520ee5 to d0eed51 Compare January 15, 2026 19:21

sokra force-pushed the sokra/aggregation-update-tracing branch 2 times, most recently from 6f2d839 to 8d53511 Compare January 16, 2026 05:45

sokra force-pushed the sokra/chunk-item-id-selective branch 2 times, most recently from 6fd4d59 to 81b41b9 Compare January 16, 2026 05:46

sokra changed the base branch from sokra/aggregation-update-tracing to graphite-base/88411 January 16, 2026 07:04

sokra force-pushed the graphite-base/88411 branch from 8d53511 to b21b3f6 Compare January 16, 2026 08:12

sokra force-pushed the sokra/chunk-item-id-selective branch from 81b41b9 to 2c5cc09 Compare January 16, 2026 08:12

sokra changed the base branch from graphite-base/88411 to sokra/aggregation-update-tracing January 16, 2026 08:12

sokra requested a review from mischnic January 16, 2026 08:13

sokra force-pushed the sokra/aggregation-update-tracing branch from b21b3f6 to 89ca808 Compare January 16, 2026 09:00

sokra force-pushed the sokra/chunk-item-id-selective branch from 2c5cc09 to bab4807 Compare January 16, 2026 09:00

sokra force-pushed the sokra/aggregation-update-tracing branch 2 times, most recently from bdd5e74 to 4dae3ca Compare January 16, 2026 09:42

sokra force-pushed the sokra/chunk-item-id-selective branch from bab4807 to bc8fa95 Compare January 16, 2026 09:42

mischnic approved these changes Jan 16, 2026

View reviewed changes

sokra changed the base branch from sokra/aggregation-update-tracing to graphite-base/88411 January 16, 2026 10:09

sokra added 3 commits January 16, 2026 10:10

Turbopack: avoid chunk_item_id task and use selective cell access ins…

35e4db0

…tead

better readablity

e484226

use module instead of ModuleId

c2e1c25

sokra force-pushed the sokra/chunk-item-id-selective branch from bc8fa95 to c2e1c25 Compare January 16, 2026 10:10

sokra force-pushed the graphite-base/88411 branch from 4dae3ca to dd39efc Compare January 16, 2026 10:10

graphite-app bot changed the base branch from graphite-base/88411 to canary January 16, 2026 10:10

sokra merged commit 8d5b937 into canary Jan 16, 2026
384 of 406 checks passed

sokra deleted the sokra/chunk-item-id-selective branch January 16, 2026 12:07

wyattjoh pushed a commit that referenced this pull request Jan 16, 2026

Turbopack: avoid chunk_item_id task and use selective cell access ins…

70b2439

…tead (#88411) ### What? Use selection reads for module id to avoid functions

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Turbopack: avoid chunk_item_id task and use selective cell access instead #88411

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Turbopack: avoid chunk_item_id task and use selective cell access instead #88411

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Merging this PR will not alter performance

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