[Webkit-unassigned] [Bug 22102] New: Drop shadow Scrollperformance

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=22102

           Summary: Drop shadow Scrollperformance
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Macintosh
        OS/Version: Mac OS X 10.5
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: CSS
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: will at glookr.com


Drop shadows on large DIV's cause scroll performance to decrease dramatically.
Specifically, scrolling a large container DIV will make the scrolled document
jump instead of scrolling smoothly. The document I used a drop shadow on was of
low complexity. I believe this is a severe problem that needs to be addressed
before the drop shadow feature is released. 

CSS used: 

-webkit-box-shadow: 0 8px 64px #000;    
-webkit-border-radius: 5px; 

Performance seems to improve when the spread (64px) of the shadow is decreased,
e.g. to 10px. This must have to do with the underlying rendering algorithms.

Oh, CPU/Model was as follows (~1 year old MacBook Pro 15") :   
  Model Name:   MacBook Pro
  Model Identifier:     MacBookPro3,1
  Processor Name:       Intel Core 2 Duo
  Processor Speed:      2.4 GHz
  Number Of Processors: 1
  Total Number Of Cores:        2
  L2 Cache:     4 MB
  Memory:       2 GB
  Bus Speed:    800 MHz


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