Bug 256105

Summary: [GTK] Extremely slow animation of scaled images with shadows on the Divi theme website showcase page
Product: WebKit Reporter: Jeff Fortin <nekohayo>
Component: WebKitGTKAssignee: Nobody <webkit-unassigned>
Status: NEW    
Severity: Normal CC: bugs-noreply
Priority: P2 Keywords: Performance
Version: Other   
Hardware: PC   
OS: Linux   
See Also: https://bugs.webkit.org/show_bug.cgi?id=221738
https://bugs.webkit.org/show_bug.cgi?id=215045
Bug Depends on:    
Bug Blocks: 245783    
Attachments:
Description Flags
sysprof screenshot
none
sysprof capture none

Jeff Fortin
Reported 2023-04-28 13:25:10 PDT
Besides the general scrolling performance issuet that is bug #215045, on https://www.elegantthemes.com/gallery/divi/ there is an additional performance problem I have recently discovered: hovering the screenshot "cards" (the images just below the "Full Website Packs" section; ctrl+F for that) in that page are slow as hell to animate on mouse hover, even on Wayland with triple-buffering. Tested on my desktop workstation with open source AMD Radeon R7/R9 270 graphics in the Wayland session, but the problem also was visible on Xorg and on other computers too. In comparison, it's butter-smooth in Chromium on Xorg, a bit laggy on Firefox on Xorg, fairly smooth with Firefox on Wayland. The Firefox bug report is https://bugzilla.mozilla.org/show_bug.cgi?id=1823474 where you can see some of their insights, if any might apply to WebKitGTK as well... If it's because of the shadows, it might or might not be related to bug #221738 as well. However, looking at the sysprof output, it seems to be related to pixman and cairo.
Attachments
sysprof screenshot (202.02 KB, image/png)
2023-04-28 13:27 PDT, Jeff Fortin 		no flags
Details
sysprof capture (1.82 MB, application/x-xz)
2023-04-28 13:28 PDT, Jeff Fortin 		no flags
Details
View All Add attachment proposed patch, testcase, etc.
Jeff Fortin
Comment 1 2023-04-28 13:27:47 PDT
Created attachment 466130 [details] sysprof screenshot
Jeff Fortin
Comment 2 2023-04-28 13:28:59 PDT
Created attachment 466131 [details] sysprof capture
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