Bug 98689

Summary:

[META] static scrolling example is very slow

Product:

WebKit

Reporter:

Eric Seidel (no email) <eric>

Component:

Layout and Rendering

Assignee:

Nobody <webkit-unassigned>

Status:

NEW

Severity:

Normal

CC:

fishd, jamesr, jchaffraix, simon.fraser, thorton

Priority:

Version:

528+ (Nightly build)

Hardware:

Unspecified

OS:

Unspecified

Attachments:

Description	Flags
test case (uses an http://webkit.org link for the images)	none
Sample of r130657 scrolling in Safari	none

Eric Seidel (no email)

Reported 2012-10-08 14:43:49 PDT

[META] static scrolling example is very slow Attached is a (slightly modified) version of a scrolling test from another member of the Chrome team. Both Safari and Chrome are slow at scrolling this (simple static page!)

Attachments
test case (uses an http://webkit.org link for the images) (5.12 KB, text/html) 2012-10-08 14:44 PDT, Eric Seidel (no email)	no flags	Details
Sample of r130657 scrolling in Safari (1.03 MB, application/zip) 2012-10-08 14:45 PDT, Eric Seidel (no email)	no flags	Details
View All Add attachment proposed patch, testcase, etc.

Eric Seidel (no email)

Comment 1 2012-10-08 14:44:18 PDT

Created attachment 167617 [details] test case (uses an http://webkit.org link for the images)

Eric Seidel (no email)

Comment 2 2012-10-08 14:45:05 PDT

Created attachment 167618 [details] Sample of r130657 scrolling in Safari

James Robinson

Comment 3 2012-10-08 15:00:46 PDT

The -webkit-box-shadows appear to be responsible for the majority of the paint time cost.

Simon Fraser (smfr)

Comment 4 2012-10-08 15:01:08 PDT

Lots of clipping for shadows.

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