[Webkit-unassigned] [Bug 87571] New: WebProcess sends many synchronous messages to the UI process while scrolling beneath ScrollView::contentsToScreen()

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=87571

           Summary: WebProcess sends many synchronous messages to the UI
                    process while scrolling beneath
                    ScrollView::contentsToScreen()
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Keywords: InRadar
          Severity: Normal
          Priority: P2
         Component: Event Handling
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: mitz at webkit.org


<rdar://problem/11439771>

Looking at a WebProcess sample from scrolling a fairly simple page, I noticed over a 1/10 of the time was spent beneath ScrollView::contentsToScreen() waiting on a synchronous message to the UI process. This function is called from EventHandler::fakeMouseMoveEventTimerFired().

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