[Webkit-unassigned] [Bug 16709] WebSite snow effect is *ridiculously* slow on a 30" display

[bugzilla-daemon at webkit.org]

http://bugs.webkit.org/show_bug.cgi?id=16709





------- Comment #2 from mrowe at apple.com  2008-01-02 07:30 PDT -------
I'm seeing terrible things happening on a 17" MBP with a largish window.  Looks
like it runs at around one frame every few seconds.  Shark's "System Trace"
shows that a huge amount of time is spent in VM faults and system calls.  The
system calls are primary mmap/munmap/vm_allocate/vm_copy, called as a result of
a "realloc" below -[NSView setNeedsDisplayInRect:], called from
ScrollView::updateContents.  The VM faults are primarily zero fills of the
results of these allocations.  The VM faults and system calls account for
around 35% of Safari's CPU time during a 10 second sample of the system!


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