Chunk loader scans whole DOM

“The boot / hydration tasks show self time in querySelectorAll called from doLoadChunk → loadChunkCached → loadChunkByUrlWhole, growing with n.”

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I hit this bug: rapsheet.dev/sheets/next-js/issues/11464/file
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Chunk loader scans whole DOM per chunk at boot. Boot and hydration tasks show querySelectorAll self time from doLoadChunk in runtime-backend-dom.ts, growing with DOM size.

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File my report

Where: Turbopack chunk loader
Versions: 16.5.0-canary.8
How bad: Breaks a normal workflow.

Original reports2, newest first

Oct 11, 2026Turbopack: chunk loader scans the whole DOM with querySelectorAll for every chunk (O(DOM × chunks) main-thread cost at boot)On GitHub#99993
Oct 11, 2026Turbopack: chunk loader scans the whole DOM with querySelectorAll for every chunk (O(DOM × chunks) main-thread cost at boot)On GitHub#99992

Chunk loader scans whole DOM

Is this your bug? What gets counted gets fixed. Pile on.

Is this your bug?

Original reports2, newest first

Do you work on Next.js?