Bug 155309

Summary:	build.webkit.org/waterfall scrolling is noticeably slower in WebKit/Safari than Chrome
Product:	WebKit	Reporter:	Dean Johnson <dean_johnson>
Component:	Layout and Rendering	Assignee:	Nobody <webkit-unassigned>
Status:	RESOLVED MOVED
Severity:	Normal	CC:	beidson, simon.fraser, webkit-bug-importer, zalan
Priority:	P2	Keywords:	InRadar
Version:	WebKit Nightly Build
Hardware:	Mac
OS:	Unspecified

Description Dean Johnson 2016-03-10 11:35:56 PST

Similar issues can also be seen trying to load a build log such as here: https://build.webkit.org/builders/Apple%20El%20Capitan%20Release%20(Build)/builds/4401/steps/compile-webkit/logs/stdio
You'll notice when scrolling on the page that the screen will go white (not rendering quick enough?) in Safari, but not at all or much less in Chrome.

Sorry if the component is incorrect.

Oddly enough, this issue doesn't seem to present itself on iOS.

Comment 1 Radar WebKit Bug Importer 2016-03-10 11:36:32 PST

<rdar://problem/25090185>

Comment 2 Brady Eidson 2016-03-10 11:47:21 PST

The data is getting there just fine. This is possibly (likely?) a tiled scrolling issue?

Comment 3 Simon Fraser (smfr) 2016-03-10 11:52:29 PST

The slow build logs are a known issue with large amounts text.

The waterfall being slow is likely different, possibly table rendering.

Comment 4 Simon Fraser (smfr) 2016-03-10 11:59:00 PST

This is a Safari bug, not a WebKit bug. Lots of time in form autofill.