wg-performance Status Update 2020-12-07

[erwinmombay]

What was accomplished

• module build rollout is in 100%
• Started privacy & legal reviews for adding CWV metrics from Google AMP cache to Page Experience tool
• exclude iOS < 11 specifically from module build insertion

Lessons Learned

What's Next

• fixes for double exec of module/nomodule in iOS < 11 in the runtime
• Working on APIs for CWV metrics from Google AMP Cache

[jridgewell]

What was accomplished

• Investigated server latency when serving images from Cache

Lessons Learned

What's Next

• Working on AVIF design

[samouri]

What was accomplished

• AMP Compiler prototyping: https://github.com/ampproject/amphtml/pull/31311
• Fixed bug in resources related to documentHeight changes + intersect-resources (affecting amp4email): https://github.com/ampproject/amphtml/pull/31376
• Created a hosted Viewer for testing AMP Documents.
• Fixed newly introduced bug with viewportObserver: https://github.com/ampproject/amphtml/pull/31357

Lessons Learned

• Discovered an InOb WebKit bug: https://bugs.webkit.org/show_bug.cgi?id=219495

What's Next

• InOb work:
  • Get InOb polyfill through code review: https://github.com/w3c/IntersectionObserver/pull/465
  • Relaunch intersect-resources in amp4email: https://github.com/ampproject/amphtml/pull/31439
  • Improve InOb polyfill integration to select the best implementation on a per-instance basis ()
  • Write e2e test for a test viewer that pays attn to documentHeight (https://github.com/ampproject/amphtml/issues/31232#issuecomment-739086372) to hopefully catch amp4email regressions before we merge.
• AMP Compiler: research