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Add option to control dev memory threshold restarts - #96144

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timneutkens merged 3 commits into
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codex/disable-dev-memory-threshold
Jul 28, 2026
Merged

Add option to control dev memory threshold restarts#96144
timneutkens merged 3 commits into
canaryfrom
codex/disable-dev-memory-threshold

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@timneutkens timneutkens commented Jul 24, 2026 •
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Summary

Adds experimental.devMemoryThresholdRestart, defaulting to true, so projects can set it to false to opt out of the development server restart that occurs when V8 heap usage exceeds 80%. The option has no effect on next start.

Verification

  • Focused config-loading and memory-threshold unit suites passed
  • pnpm --filter=next build completed JavaScript compilation, then failed on pre-existing sharp and @vercel/detect-agent declaration errors unrelated to this change

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Stats from current PR

🟢 2 improvements

Metric Canary PR Change Trend
Webpack Build Time 25.749s 24.993s 🟢 756ms (-3%) ▁▃▃▃▄
Webpack Cold (First Request) 3.589s 3.474s 🟢 115ms (-3%) ▁▄▂▂▂
📊 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) 812ms 811ms ✓ ▂▁▂▁▂
Cold (Ready in log) 772ms 774ms ✓ ▂▁▁▁▁
Cold (First Request) 1.275s 1.282s ✓ ▃▁▁▁▁
Warm (Listen) 813ms 812ms ✓ ▂▁▂▁▂
Warm (Ready in log) 779ms 772ms ✓ ▂▁▁▁▂
Warm (First Request) 1.260s 1.252s ✓ ▂▁▁▁▂
📦 Dev Server (Webpack) (Legacy)

📦 Dev Server (Webpack)

Metric Canary PR Change Trend
Cold (Listen) 822ms 813ms ✓ ▁▅▅▅▁
Cold (Ready in log) 818ms 801ms ✓ ▁▄▃▃▂
Cold (First Request) 3.589s 3.474s 🟢 115ms (-3%) ▁▄▂▂▂
Warm (Listen) 814ms 814ms ✓ ▁▄▁▅▄
Warm (Ready in log) 809ms 797ms ✓ ▁▃▂▃▂
Warm (First Request) 3.555s 3.522s ✓ ▁▂▂▂▂

⚡ Production Builds

Metric Canary PR Change Trend
Fresh Build 5.065s 4.931s ✓ ▃▁▂▁▃
Cached Build 5.084s 4.880s ✓ ▄▁▂▁▃
📦 Production Builds (Webpack) (Legacy)

📦 Production Builds (Webpack)

Metric Canary PR Change Trend
Fresh Build 25.749s 24.993s 🟢 756ms (-3%) ▁▃▃▃▄
Cached Build 24.937s 25.049s ✓ ▁▃▃▂▄
node_modules Size 528 MB 528 MB ✓ ▁▁▁▁▁
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Server

Middleware
Canary PR Change
middleware-b..fest.js gzip 780 B 775 B ✓
Total 780 B 775 B ✅ -5 B
Build Details
Build Manifests
Canary PR Change
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Total 429 B 434 B ⚠️ +5 B

📦 Webpack

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3322-HASH.js gzip 63.8 kB N/A -
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7920-HASH.js gzip 4.68 kB N/A -
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Polyfills
Canary PR Change
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Pages
Canary PR Change
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Server

Edge SSR
Canary PR Change
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Middleware
Canary PR Change
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Total 47.1 kB 46.7 kB ✅ -302 B
Build Details
Build Manifests
Canary PR Change
_buildManifest.js gzip 718 B 718 B ✓
Total 718 B 718 B ✓
Build Cache
Canary PR Change
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🔄 Shared (bundler-independent)

Runtimes
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dist_client_...dev.js gzip 317 B 317 B ✓
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📝 Changed Files (1 file)

Files with changes:

  • server.runtime.prod.js
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server.runtime.prod.js

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📎 Tarball URL 
https://vercel-packages.vercel.app/next/commits/4961ac07dbb9acda23ba8c98ea789f4a84244f67/next

Commit: 4961ac0

@github-actions

github-actions Bot commented Jul 24, 2026 •
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Tests Passed

Commit: 4961ac0

@timneutkens
timneutkens marked this pull request as ready for review July 25, 2026 04:24
@timneutkens
timneutkens marked this pull request as draft July 25, 2026 04:24
@timneutkens timneutkens changed the title Add option to disable dev memory threshold handling Add option to control dev memory threshold restarts Jul 25, 2026
@timneutkens
timneutkens marked this pull request as ready for review July 25, 2026 08:53
@timneutkens
timneutkens requested a review from gaearon July 25, 2026 08:54
@timneutkens
timneutkens merged commit 1de0812 into canary Jul 28, 2026
228 of 230 checks passed
@timneutkens
timneutkens deleted the codex/disable-dev-memory-threshold branch July 28, 2026 17:22
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@timneutkens @gaearon