wg-performance Status Update 2022-02-14

[erwinmombay]

cc @ampproject/wg-performance

What was accomplished

Lessons Learned

What's Next

[rcebulko]

What was accomplished

• traffic experiments for Bento Compiler
• BC service distribution and latency improvements
• Various bugfixes and improvements to metrics reporting/collection
• minimum-RTV threshold
• Hand-off planning for work related to https://github.com/ampproject/amphtml/issues/37129

Lessons Learned

• Deploying high-availability low-latency services is tricky

What's Next

• Traffic ramp-up and monitoring

[alexnj]

What was accomplished

• go/client-ab: Updated the design document to incorporate some of the feedback.
• Prototype updated to avoid runtime evaluations — transforms now encoded as JS functions at PRE_UA.
• Open source review completed and launched at https://github.com/alexnj/ab-worker-prototype.

Lessons Learned

• Open source speed-run process at Google.

What's Next

• Prototype a restricted set of serialization types.
• Draft design documents for:
  • Browser-integrated GDPR Privacy/Cookie Consent spec.
  • Paywall detection and link decoration.
• Chrome Speed Metrics team presentation of go/client-ab.

[samouri]

What was accomplished

bento compiler

• Integrations pains of BC backend and frontend. So many bugs (https://github.com/ampproject/amphtml/pull/37652, https://github.com/ampproject/bento-compiler/pull/41, https://github.com/ampproject/worker-dom/pull/1133, https://github.com/ampproject/worker-dom/pull/1132, https://github.com/ampproject/bento-compiler/pull/40)
• One more in-progress: https://github.com/ampproject/amphtml/pull/37671
• Measured performance benefit of BC, and it can improve LCP by 45%! (https://github.com/ampproject/amphtml/pull/37646)

other

• https://github.com/ampproject/amp.dev/pull/6291
• https://github.com/ampproject/amphtml/pull/37630
• https://github.com/ampproject/amphtml/pull/37619
• https://github.com/ampproject/amphtml/pull/37599
• https://github.com/ampproject/amphtml/pull/37594
• https://github.com/ampproject/amphtml/pull/37561
• https://github.com/ampproject/bentojs.dev/pull/172
• Kris departure documents/writeups

What's Next

• More BC Integration / ramp-up / measurements.

[erwinmombay]

What was accomplished

• build localization strings for amp-story to be deployed on cache https://github.com/ampproject/amphtml/pull/37623
• fixed critical amp-story bug in iOS where the dvh-polyfill script was not getting calculated correctly since the meta[name=viewport] tag would cause a resize but no event fired

Lessons Learned

• meta[name=viewport] ordering matters and is better as one of the first elements in head

What's Next

• inline amp-story translations strings as part of an experiment

[jridgewell]

What was accomplished

• Launched size-adjsut experiment for Google Fonts
• Make image ingestion resilient to individual format transcoding errors
• Design doc for making image resizing better
• https://github.com/ampproject/amphtml/pull/37640
  • https://github.com/ampproject/amphtml/pull/37653
  • https://github.com/ampproject/amphtml/pull/37660
• https://github.com/ampproject/amphtml/pull/37641
• https://github.com/ampproject/error-tracker/pull/138
• Investigated Brotli support in CloudFlare Workers
  • The default compression is using a fast quality that produces large sizes (even larger than GZIP!).
  • Worked out how to support precompressed .js.br files again.
• Code reviews on bento module patterns
• Work on string-dedent TC39 proposal
• Making babel sourcemap merging faster (and bugfixes, sorry!)
  • https://github.com/babel/babel/pull/14209
  • https://github.com/babel/babel/pull/14247
  • https://github.com/babel/babel/pull/14253
  • https://github.com/babel/babel/pull/14253

Lessons Learned

What's Next

• Prepending brotli streams
• Supporting edge-cached AMP documents
• WASM jolt