RESOLVED DUPLICATE of bug 157631 156506
Scrolling on Github code viewer is not smooth 
https://bugs.webkit.org/show_bug.cgi?id=156506
Summary Scrolling on Github code viewer is not smooth
Ryosuke Niwa
Reported 2016-04-12 11:12:25 PDT
Visit https://github.com/WebKit/webkit/blob/master/Source/WebCore/dom/Document.cpp on Safari Technology Preview and scroll on the first generation 15" Retina MBP. It feels very slow and shows a lot of flash tiles.
Attachments
Add attachment proposed patch, testcase, etc.
Ryosuke Niwa
Comment 1 2016-04-12 11:12:39 PDT
white* tiles.
Simon Fraser (smfr)
Comment 2 2016-04-12 11:24:20 PDT
Lots of time clipping under paintOutlineForFragments.
Radar WebKit Bug Importer
Comment 3 2016-04-12 11:24:42 PDT
<rdar://problem/25684695>
Ryosuke Niwa
Comment 4 2016-04-12 11:25:08 PDT
I wonder if the Github page is also mutating the DOM as we scroll?
Simon Fraser (smfr)
Comment 5 2016-04-12 11:49:28 PDT
This is similar to bug 155728.
zalan
Comment 6 2016-04-12 16:28:37 PDT
Each (source)line on that page is a <tr> with 2 <td>s in it. I bet it's slow because of some table inefficiency.
Dave Hyatt
Comment 7 2016-05-18 12:06:04 PDT
This was fixed by the 157631 fix.
Jon Lee
Comment 8 2016-05-18 12:10:48 PDT
*** This bug has been marked as a duplicate of bug 157631 ***
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