[Webkit-unassigned] [Bug 26613] New: [Qt] Severe performance degradation when using "float:" CSS properties
bugzilla-daemon at webkit.org
bugzilla-daemon at webkit.org
Mon Jun 22 11:01:25 PDT 2009
https://bugs.webkit.org/show_bug.cgi?id=26613
Summary: [Qt] Severe performance degradation when using "float:"
CSS properties
Product: WebKit
Version: 528+ (Nightly build)
Platform: Macintosh
OS/Version: Mac OS X 10.5
Status: UNCONFIRMED
Severity: Major
Priority: P2
Component: CSS
AssignedTo: webkit-unassigned at lists.webkit.org
ReportedBy: gcarvalho.pt at gmail.com
NOTE: I'm using Qt's main trunk version from their git repository (Not sure
what webkit version it is).
When I have over 100 DIV's, each with text and images, if a lot of the elements
within those DIV's are positioned by using "float", selecting text can take up
to 5 seconds. Removing the float property causes selection to be instantaneous,
even with thousands of DIV's. A quick ( not very scientific ) test with Safari
3 and 4 revealed no such degradation.
How to repoduce:
Load a file with a few hundred DIV's. Each DIV should have a <p> with text and
an <img> with a small image ( it can be the same in all DIV's). The <img>
should have a class (Let's call it "testicon" )
In the CSS set ".texticon { float:left }". Load the file and try to select some
text. I get a 3 to 5 second delay with 200 DIV's, on a black macbook. Removing
the float restores the performance to the expected level, no degradation with
up to thousands of DIV's.
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