[Webkit-unassigned] [Bug 66184] New: Table border-collapse and transparency performance issues

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=66184

           Summary: Table border-collapse and transparency performance
                    issues
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Macintosh
               URL: http://chadvonnau.com/projects/web/examples/webkit-tab
                    le-bug/bordercollapse.html
        OS/Version: Mac OS X 10.6
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Tables
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: chadwhee at yahoo.com


I've made some examples to demonstrate some performance bugs with table rendering. 
These examples are the same content with different styling:

1) Normal scrolling. Solid borders and border-collapse:separate

 http://chadvonnau.com/projects/web/examples/webkit-table-bug/index.html

2) Slow scrolling. Solid borders and border-collapse:collapse

 http://chadvonnau.com/projects/web/examples/webkit-table-bug/bordercollapse.html

3) Very slow scrolling and beach ball of death.
   Semi-transparent RGBA borders and border-collapse:separate

 http://chadvonnau.com/projects/web/examples/webkit-table-bug/rgbaborders.html


I'm testing with Safari 5.1 and OS X 10.6.8 (+update) on my Late 2006 MacBook Pro.

Firefox 4 sees roughly equal performance on on all of those examples.
Safari 5.0 and earlier sees about the same performance on each example.
Chrome 13.0.7 has similar performance issues with these examples.

I reported what I believe to be the same issue to Google several months back. Here's my bug report with google:

 http://code.google.com/p/chromium/issues/detail?id=68215

Perhaps these issues may be coming from webkit code that Google has been using for a few months but only made it into Safari in 5.1.

Here is another page that exhibits performance problems because of border-collapse:collapse

 http://panlex.org/u

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