[Webkit-unassigned] [Bug 226330] Shadow DOM unnecessarily invalidated on pseudo element change, causing CPU spikes

Wed Jun 22 21:43:21 PDT 2022

https://bugs.webkit.org/show_bug.cgi?id=226330

--- Comment #8 from zalan <zalan at apple.com> ---
I did a bit of profiling on this and it looks like (after the invalidation fix), this is simply about iterating over that massive amount of content when computing selection boundary. 
The following, simple markup triggers this issue:

<body>
Click Me<input type="checkbox"><br>
    <span></span>
    <span></span>
    <span></span>
    <span></span>
    <span></span>
repeat it for a few thousands of times
</body>

It looks like VisibleSelection needs a more efficient way to figure out the selection end on user action (or in general for that matter).

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