[Webkit-unassigned] [Bug 86813] New: WebKit spends ~20% of time in HTMLTextAreaElement::defaultValue() when opening a review page

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=86813

           Summary: WebKit spends ~20% of time in
                    HTMLTextAreaElement::defaultValue() when opening a
                    review page
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Forms
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: rniwa at webkit.org
                CC: eric at webkit.org, koivisto at iki.fi, ojan at chromium.org,
                    tkent at chromium.org, kling at webkit.org, fpizlo at apple.com


Reproduction steps:
1. Open https://bugs.webkit.org/attachment.cgi?id=142634 (Caution: 5MB!)
2. Instrument the Web Process while WebKit opens it

Observe that we spend 19.5% of time in HTMLTextAreaElement::defaultValue() inside HTMLTextAreaElement::childrenChanged, which in turn is called by ContainerNode::parserAddChild (18.5%).

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