[Webkit-unassigned] [Bug 77012] New: Screen freezing for short time while scrolling.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=77012

           Summary: Screen freezing for short time while scrolling.
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: WebCore Misc.
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: jungjik.lee at samsung.com


I found a short time screen freezing while scrolling in GTK and EFL port.
And it was because of the FontCachePurgePreventer.
When the screen is updated, almost every time the browser calls FontCachePurgePreventer.
FontCachePurgePreventer tries to purge the inactive fallback fonts.
It's ok in pages written in alphabet (because it is under font cache limits),
But it becomes overhead in pages written in CJK or none-alphabet.
Actually it takes quite significant time to look inactive fonts up in hash table.
So I simply suggest that FontCachePurgePreventer remains only in (FrameView::reset function).
I will file a patch soon. Any advice will be welcomed.

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