Bug 192284

Summary: EditorState code triggers additional layer flushes
Product: WebKit Reporter: Simon Fraser (smfr) <simon.fraser>
Component: HTML EditingAssignee: Nobody <webkit-unassigned>
Status: NEW    
Severity: Normal CC: ap, rniwa, simon.fraser, wenson_hsieh
Priority: P2    
Version: WebKit Nightly Build   
Hardware: Unspecified   
OS: Unspecified   

Simon Fraser (smfr)
Reported 2018-12-01 20:58:47 PST
There are two code paths that trigger compositing layer flushes that would otherwise not happen; this may cause extra painting, which has a perf cost. They are WebPage::sendPartialEditorStateAndSchedulePostLayoutUpdate() and WebPage::sendEditorStateUpdate(). I see these get called when running this Speedometer subtest: http://browserbench.org/Speedometer2.0/?suite=VueJS-TodoMVC&iterationCount=100
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