Bug 240440 - frequently restyled content can spend significant time recomputing whether text nodes are entirely HTML space characters
Summary: frequently restyled content can spend significant time recomputing whether te...
Status: RESOLVED WORKSFORME
Alias: None
Product: WebKit
Classification: Unclassified
Component: DOM (show other bugs)
Version: WebKit Nightly Build
Hardware: Unspecified Unspecified
: P2 Normal
Assignee: Nobody
URL:
Keywords: InRadar
Depends on:
Blocks:
 
Reported: 2022-05-15 18:35 PDT by Cameron McCormack (:heycam)
Modified: 2023-05-29 19:57 PDT (History)
1 user (show)

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Description Cameron McCormack (:heycam) 2022-05-15 18:35:17 PDT 
In the MotionMark Design subtest, we spend 1% of Web content process time in isAllSpecialCharacters<isHTMLSpace> under TreeResolver::resolveComposedTree.  This is because the cloned <table> elements that are used for the text trails have all white space text nodes between tags, and we end up looking through all those text node characters.  We can cache the result in a node flag to avoid this.
Comment 1 Radar WebKit Bug Importer 2022-05-15 18:35:25 PDT 
<rdar://problem/93319600>
Comment 2 Cameron McCormack (:heycam) 2023-05-29 19:57:41 PDT 
Closing this as unneeded for now.