Bug 16709

Summary: WebSite snow effect is *ridiculously* slow on a 30" display
Product: WebKit Reporter: Eric Seidel (no email) <eric>
Component: New BugsAssignee: Nobody <webkit-unassigned>
Status: NEW    
Severity: Normal CC: ap, mrowe
Priority: P2    
Version: 528+ (Nightly build)   
Hardware: Mac   
OS: OS X 10.4   
URL: http://www.parunclub.com/welcome.htm
Attachments:
Description Flags
web archive none

Eric Seidel (no email)
Reported 2008-01-02 07:18:57 PST
WebSite snow effect is *ridiculously* slow on a 30" display http://www.parunclub.com/welcome.htm We'll probably have to grab a copy of the site before it disappears.
Attachments
web archive (376.03 KB, application/x-webarchive)
2008-01-02 07:19 PST, Eric Seidel (no email) 		no flags
Details
View All Add attachment proposed patch, testcase, etc.
Eric Seidel (no email)
Comment 1 2008-01-02 07:19:42 PST
Created attachment 18237 [details] web archive
Mark Rowe (bdash)
Comment 2 2008-01-02 07:30:36 PST
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!
Alexey Proskuryakov
Comment 3 2009-12-02 15:31:18 PST
Works fine with a 24" screen for me (Safari 4.0.4, Mac OS X 10.6.2).
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