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Garry Tan
78afd75e72
The Bun-side accelerant on the gbrowser-OOM investigation. Pre-fix, the per-page requestfinished listener called \`await res.body()\` just to read .length — Playwright fetches the bytes from Chromium across CDP into a Bun Buffer, only for the listener to discard the buffer after a single length read. On a long-lived headed browser with media-heavy pages this is multi-GB/hour of Buffer allocation churn. Bun GCs it, but the cross-process CDP traffic + transient allocation pressure feeds the OOM trajectory. The fix: req.sizes() pulls from the Network.loadingFinished event Chromium already emits. No body materialization. Accurate for chunked transfer, gzip-compressed responses, and streaming media — the cases where a naive Content-Length header read (the original review's proposal) would have missed the size entirely (Codex flag on the eng review, D10 USE_CDP_EVENT_BATCHED). The D10 stretch goal — replacing N per-page listeners with a single context-level CDP listener via Target.setAutoAttach — is deferred and tracked in TODOS. The listener architecture change is significantly more plumbing than the leak fix and not on the critical path for stopping the body materialization. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>