[Webkit-unassigned] [Bug 54108] New: Slow loads stall initial layout/paint

Wed Feb 9 08:48:55 PST 2011

https://bugs.webkit.org/show_bug.cgi?id=54108

           Summary: Slow loads stall initial layout/paint
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
               URL: http://solid.eqoppa.com/testlag.html
        OS/Version: All
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: WebCore Misc.
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: silvio.ventres at gmail.com

When there is a blocking script/css link in <head> or beginning of <body>, the engine stalls until the link is resolved.
Given the prevalence of non critical slow-loading cross-domain scripts, such as ads and analytics trackers, a heuristic that
prioritizes same-origin css/scripts over cross-domain ones will possibly allow the initial layout/paint event to happen
earlier, instead of showing a blank page while stalling.

Possible/probable adverse side effect: on pages with dependencies bound to the deprioritized scripts, in worst case, a full reparse might be needed.
To weigh the performance impact, some testing is needed.

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