[turbopack] Tracing and debugging fixes by lukesandberg · Pull Request #92412 · vercel/next.js

lukesandberg · 2026-04-06T17:27:01Z

Fix sst_inspect.rs to correctly use the CURRENT file
Add table names to trace spans in turbo-persistence
Add a span + reason to our batch reading API

lukesandberg · 2026-04-06T17:27:15Z

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[turbopack] Tracing and debugging fixes #92412 👈 (View in Graphite)
change the process name of builds #92411 : 1 other dependent PR (#92414 )
canary

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tracing improvements

codspeed-hq · 2026-04-06T17:46:35Z

Merging this PR will not alter performance

✅ 17 untouched benchmarks
⏩ 3 skipped benchmarks¹

_{Comparing tracing_improvements (f6297db) with canary (9931cc0)²}

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. ↩
No successful run was found on 04-06-change_the_process_name_of_builds (c491a83) during the generation of this report, so canary (9931cc0) was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩

nextjs-bot · 2026-04-06T18:09:43Z

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)	456ms	456ms	✓	▅▅▅▅▁
Cold (Ready in log)	443ms	439ms	✓	▅▇█▂▁
Cold (First Request)	1.126s	1.131s	✓	▁▆██▆
Warm (Listen)	456ms	456ms	✓	▁▁▁██
Warm (Ready in log)	441ms	441ms	✓	▇▇█▁▂
Warm (First Request)	341ms	346ms	✓	▇▅▇▁▃

📦 Dev Server (Webpack) (Legacy)

📦 Dev Server (Webpack)

Metric	Canary	PR	Change	Trend
Cold (Listen)	456ms	455ms	✓	▆▃▆▃▆
Cold (Ready in log)	433ms	433ms	✓	▇▅▆▃▂
Cold (First Request)	1.933s	1.936s	✓	█▇█▄▆
Warm (Listen)	456ms	455ms	✓	█████
Warm (Ready in log)	433ms	433ms	✓	▆▅▆▃▃
Warm (First Request)	1.952s	1.957s	✓	▇▇▇▃▆

⚡ Production Builds

Metric	Canary	PR	Change	Trend
Fresh Build	3.889s	3.829s	✓	█▅█▅▇
Cached Build	3.875s	3.865s	✓	█▄▅█▅

📦 Production Builds (Webpack) (Legacy)

📦 Production Builds (Webpack)

Metric	Canary	PR	Change	Trend
Fresh Build	14.339s	14.334s	✓	██▇▁▁
Cached Build	14.492s	14.492s	✓	███▃▂
node_modules Size	488 MB	488 MB	✓	▄▄▅██

📦 Bundle Sizes

Bundle Sizes

⚡ Turbopack

Client

Main Bundles

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Total	464 kB	464 kB	✅ -51 B

Server

Middleware

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Total	722 B	717 B	✅ -5 B

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Polyfills

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🔄 Shared (bundler-independent)

Runtimes

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pages.runtim..prod.js gzip	39 kB	39 kB	✓
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📎 Tarball URL

https://vercel-packages.vercel.app/next/commits/f6297dbee0ee340e404c6d4067e986a870625347/next

nextjs-bot added created-by: Turbopack team PRs by the Turbopack team. Turbopack Related to Turbopack with Next.js. labels Apr 6, 2026

This was referenced Apr 6, 2026

fetch: respect HTTP Cache-Control headers with TTL-based invalidation (#91729) #92322

Draft

simplify session dependent tasks (#91729) #92358

Draft

This was referenced Apr 6, 2026

change the process name of builds #92411

Merged

[turbopack] Reduce persistence buffer lifetimes #92413

Closed

lukesandberg changed the title ~~tiny debugging hacks~~ [turbopack] Tracing and debugging fixes Apr 6, 2026

tiny debugging hacks

f6297db

tracing improvements

lukesandberg force-pushed the tracing_improvements branch from 31c5fbe to f6297db Compare April 6, 2026 17:46

lukesandberg closed this Apr 6, 2026

This was referenced Apr 6, 2026

Fix sst inspect tool to respect CURRENT and stale sst files #92414

Merged

[turbopack] add family name to many spans #92415

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[turbopack] Tracing and debugging fixes#92412

[turbopack] Tracing and debugging fixes#92412
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Stats from current PR

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lukesandberg commented Apr 6, 2026 •

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