wg-performance Status Update 2021-07-07

[erwinmombay]

cc @ampproject/wg-performance

What was accomplished

Lessons Learned

What's Next

[rcebulko]

What was accomplished

• more core migration
• compiler security sandbox + V8 translation

Lessons Learned

• segfaults aren't fun
• Closure Compiler type-checking and Preact don't work together at all

What's Next

• determining next steps on compiler
• experiments with modulepreload and moving script tags

[erwinmombay]

What was accomplished

• added Timing-Allow-Origin to images and videos served off of the AMP cache
• experiment write up for external render blocking stylesheets
• refined font testing results to focus on font-display: optional and combination of font servers + stylesheet servers

Lessons Learned

What's Next

• size-adjust experiment which is a type of font correction pattern to reduce CLS on font upgrade
• Determine if amp-geo prerendering is beneficial

[jridgewell]

What was accomplished

• Week off
• Launched AVIF/WebP
• Outlined changes needed for amp-geo SSRP: https://docs.google.com/document/d/1gbv3qmkWRyrES80hadbh5t44r8sjGyk_H7Natxp_IBQ/edit?usp=sharing
• Debugged issue with Timing-Allow-Origin header
• Debugged issue with Client Side Experiments causing test failures in TAP: cl/382435060
• Fixed logging of Server Side Experiments: cl/381954884

Lessons Learned

What's Next

• Outlining JOLT
• TC39

[samouri]

What was accomplished

• Found a bug in TS that led to a bug in worker-dom. Both fixed now!
• Updated z-index rules to ignore bento dist builds (build: fix z-index amphtml#35106)
• CLS fix for amp-fit-text 0.1: amp-fit-text: fix cls by hiding until font size calculation amphtml#35105
• performance tracking fixes for LCP to use startTime instead of render/load times based on discussion with the metrics folks (performance-impls: LCP should use startTime amphtml#35070).

What's Next

• Consolidating all of our build-time constants (build-system: consolidate all build time constants amphtml#34327)
• Updates to performance-impl to start tracking LCP Element type (performance-impl: start tracking lcp element amphtml#35123)
• Creating new AMP CDN Binary for server rendering, as well as extracting more helpers to make this possible.
• Investigate using cf optimizer with a WP site
• More buildDom extraction for server rendering + unit tests.
• Bringing server rendering classic components to design review again