– DRAFT –
WebPerf Group Call

Using User Timing at scale

Dan: working on React.. CDT integration was great
… there is no way for a library to tell if user is recording or not, we're afraid of wasting memory
… we're calling clearmarks/measures all the time, but it means we can't harvest it later
… our main target is CDT
… i.e. in dev mode

an example -> https://‌facebook.github.io/‌react/‌docs/‌optimizing-performance.html#profiling-components-with-chrome-timeline

a) sounds like there is a need for API in devtools for in "record mode"

b) you should log some data to performance timeline.. perhaps with lower fidelity

Nic: we monitor React today, we look at routechange events

Dan: we expose UT for every component in dev mode

Beacon: Enforce payload limits via Fetch API

Enforce payload limits via Fetch API: https://‌github.com/‌w3c/‌beacon/‌pull/‌39

https://‌github.com/‌w3c/‌web-platform-tests/‌pull/‌4024

Performance Timeline: issues#66

timeline: https://‌github.com/‌w3c/‌performance-timeline/‌issues/‌66

Q: is this L2 or L3 feature?

we'll revisit next time.

Navigation Timing: Set `name` to document address

Set `name` to document address: https://‌github.com/‌w3c/‌navigation-timing/‌pull/‌61

shipping in M57 in Chrome, stable ~mid march

we'll pause landing it until we have confidence in it

Administrative stuff

next: charter update

Todd: we need/want charter update from MSFT end
… I'll review and merge, first pass looks good

we'll followup with plh@ on next steps

https://‌github.com/‌w3c/‌page-visibility/‌issues/‌25#issuecomment-262263862

xiaoqian: we probably need a test for prerender.

AI: let's start a new issue on the repo

we'll wait for PR until we resolve ^

https://‌github.com/‌w3c/‌hr-time/‌issues/‌32

Todd: there are tests in the WPT tree that require user input

https://‌github.com/‌w3c/‌resource-timing/‌issues/‌92#issuecomment-283204910

L2 CR for UT: https://‌github.com/‌w3c/‌user-timing/‌issues/‌19

Todd: I'll try to get the updated tests.

We'll try to triage UT2 issues before next call

next call: March 22nd