Benchmarking

1. Full-page repaints (ms time)
• Chrome
• record SkPicture, replay with nanobench
• limitation: SkPicture recordins are layer-by-layer; some pages have multiple layers
• WebRender
• record with recording API; play back
• dump frame with wrench; play back
• limitation: only works with content that Servo supports; otherwise complete frame should be available
• Advanced Layers
• no easy way to record/replay just rendering, but we can possibly instrument code
2. FPS measurement of active page
• vsync off in all cases
• perhaps bookmarklet to cycle background colour
• Chrome
• open page, look at fps
• WebRender
• open page in Servo, look at fps
• perhaps record with api, look at fps in replay (not directly comparable, but should be faster than everything)
• Advanced Layers
• open page, look at fps
3. Record & replay interactive usage
• e.g. record interacting with Google Sheets
• time how long it takes to replay entire sequence, can measure individual frame timings
• WebRender
• record/replay tool
• Chrome/Advanced Layers
• not currently possible

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- add markers to webrender recording/replay API, and replay options to work with them
- and/or improve wrench to where it's useful for the content we want to test

- bookmarklet to change background color for #2