wg-performance Status Update 2021-05-24

[erwinmombay]

cc @ampproject/wg-performance

What was accomplished

Lessons Learned

What's Next

[erwinmombay]

What was accomplished

• font testing results for combinations of optimizations such as preload, subfont, critical fonts (go/amp-font-tests)
• turned on AVIF/WebP experiment on AMP

Lessons Learned

What's Next

• Fix LCP reporting Wrong LargestContentfulPaint for direct page visits amphtml#34383
• make mjs scripts default when on amp cache (es5/nomodule build can be opted-into)

[rcebulko]

What was accomplished

• enabling type-checking in CI for src/{context,core,experiments,examiner,polyfills}
• core extraction for URL helpers, JSON helpers
• general code modernization and migration to core asserts
• first steps on updating cache transforms to support <img> tags
• iterating on sec/prev review for compiler
• experimentation with generating dependency graphs and rules via depcruise package

What's Next

• More cache-side work to support <img>
• core extraction of more URL helpers, DOM helpers, and error logic

[jridgewell]

What was accomplished

• Fixed bug with Firefox and CEv1: 🐛 Add adoptedCallback to work around Firefox Native CE bug amphtml#34455
• Send a documentHeight message after all elements are built: Check if documentHeight has changed after all elements initially built amphtml#34434
• Fixed bug with mangled private properties colliding with BaseElement's private properties: 🐛 Forbid private properties inside BaseElement amphtml#34376
• Fixed amp-web-push by initializing Logs: 🐛 Initialize Logs in web-push's helper frame endpoint amphtml#34326
• Manually tested AVIF+WebP image serving, fixed issue with AVIF quality: cl/374762384
• Added brotli compression to dynamic replacements: cl/374267378

Lessons Learned

• AVIF's quality settings are reversed, lower values mean better quality.

What's Next

• Finish SSR experimentation framework: cl/372636185
• Finish investigating WebP image quality
• Prototype Jolt implementation