Bug 207435 - Optimize style resolution for animations
Summary: Optimize style resolution for animations
Status: NEW
Alias: None
Product: WebKit
Classification: Unclassified
Component: CSS (show other bugs)
Version: Safari Technology Preview
Hardware: Unspecified Unspecified
: P2 Normal
Assignee: Nobody
URL:
Keywords: InRadar
Depends on:
Blocks:
 
Reported: 2020-02-08 16:59 PST by Simon Fraser (smfr)
Modified: 2020-02-08 17:26 PST (History)
4 users (show)

See Also:

Attachments
Animation test (980 bytes, text/html)
2020-02-08 16:59 PST, Simon Fraser (smfr) 		no flags Details
Testcase (1.04 KB, text/html)
2020-02-08 17:01 PST, Simon Fraser (smfr) 		no flags Details
Show Obsolete (1) View All Add an attachment (proposed patch, testcase, etc.)

Note You need to log in before you can comment on or make changes to this bug.
Description Simon Fraser (smfr) 2020-02-08 16:59:57 PST 
Created attachment 390186 [details]
Animation test

Animations (both old and new) currently invalidate style on the element every frame, which triggers a full TreeResolver::resolve() which is expensive. In the attached testcase, TreeResolver::resolve() is 14% of CPU time.

We should optimize style resolution with a type of invalidation for animations.
Comment 1 Simon Fraser (smfr) 2020-02-08 17:01:51 PST 
Created attachment 390187 [details]
Testcase
Comment 2 Simon Fraser (smfr) 2020-02-08 17:26:24 PST 
With 500 animating elements, style resolve time exceeds paint time.
Comment 3 Radar WebKit Bug Importer 2020-02-08 17:26:41 PST 
<rdar://problem/59290089>