This bug tracks the perf issues on the parent process's main thread (aka UI jank). There may be some commonalities in this list and the list that bug 1331674 tracks. However these are more serious issues since e10s can cover up content process main thread jank in some cases, but these will potentially cause the browser UI to lag or beach ball.
There's a lot of ~4 years old perf bugs hiding in bug 771444's dependency tree. Might be useful to triage these.
I think bug 1384733 belongs here, please add a dependency on it
Sorry, should already have marked these meta bugs as P3.
Priority: -- → P3
Summary: Stop janking the browser UI → [meta] Stop janking the browser UI
Component: DOM → DOM: Core & HTML
Product: Core → Core
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