Bug 210652

Summary: Stutter and laggy behavior on scroll with background-attachment:fixed
Product: WebKit Reporter: Nastya <nastyaskoblova.15>
Component: ScrollingAssignee: Nobody <webkit-unassigned>
Status: NEW ---    
Severity: Normal CC: bfulgham, simon.fraser, webkit-bug-importer, zalan
Priority: P2 Keywords: InRadar
Version: Safari 13   
Hardware: Mac   
OS: Unspecified   
Attachments:
Description Flags
Video about problem none

Description Nastya 2020-04-17 05:01:38 PDT 
Created attachment 396756 [details]
Video about problem

Stutter and laggy behavior on scroll when elements have background-attachment: fixed
For example
https://portfolio.logomachine.ru/matchers
Comment 1 Radar WebKit Bug Importer 2020-04-17 12:44:43 PDT 
<rdar://problem/61946434>
Comment 2 Simon Fraser (smfr) 2022-03-03 10:35:41 PST 
This is because we fall back to synchronous scrolling when there are non-root elements with background-attachment:fixed.