Please add an option to disable the "live metrics" landing page in perf tab

[Leon Sorokin]

Hello!

please add an option to disable the "live metrics" landing page in the devtools performance tab, since it intoduces what looks like a misleading memory leak in the memory heap profiler. (PerformanceEventTiming accumulation)

https://issues.chromium.org/issues/484342204

there may, in fact, be other things in the heap snapshot that are related to devtools being open rather than code and markup of the page being measured. ideally these would all be filtered out of the heap snapshots as not to add noise to the data.

thanks!

[Leon Sorokin]

come to think of it, here is a heap snapshot of a completely empty html page (html, head, title, body tags), with devtools open.

as a web dev i have no control over this, yet it's already several pages of internals i have to know to mentally discard before i see anything related to code i wrote.

it would be great to have an option (or even default behavior) to exclude this from the profile so this view represents only app code (and related internals) that i have control over.

[Leon Sorokin]

CDPSession via Puppeteer is somewhat better:

performance-related stuff on heap in Chrome vs CDPSession:

[Leon Sorokin]

heh, what's __chromium_devtools_kill_live_metrics?