Chromium perf: Metal ANGLE, 60fps pump, GPU rasterization#21
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Replace SwiftShader software rendering with Metal-backed ANGLE for hardware-accelerated compositing. Flags validated via automated benchmark sweep (40 configurations tested on RunPod). - use-angle=metal instead of swiftshader (GPU vs CPU rendering) - enable-gpu-rasterization + zero-copy for tiled GPU raster - num-raster-threads=4 (benchmark-optimal thread count) - message pump cap 30fps → 60fps to match display refresh - enable WebGL and clipboard access at browser settings level Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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| cef_browser_settings_t browserSettings = {}; | ||
| browserSettings.size = sizeof(browserSettings); | ||
| browserSettings.background_color = CefColorSetARGB(255, 255, 255, 255); | ||
| browserSettings.javascript_access_clipboard = STATE_ENABLED; |
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Setting browserSettings.javascript_access_clipboard = STATE_ENABLED unconditionally grants every loaded site JavaScript clipboard access, so a malicious or compromised page can read/overwrite the user’s system clipboard without any origin-based gating in this bridge layer. This is a production security/privacy regression for any workflow that opens untrusted URLs; keep the default behavior or gate clipboard access to trusted origins only.
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Summary
Benchmark methodology
40 flag configurations tested via automated sweep on RunPod (RTX 4090) using Chrome DevTools Protocol metrics. Winner:
--use-gl=angle --use-angle=vulkan --enable-gpu-rasterization --enable-zero-copy --num-raster-threads=4— translated to Metal equivalent for macOS.Test plan
BUGBOOK_BROWSER_CHROMIUMflag enabled🤖 Generated with Claude Code