Bug 310814

Summary:

[GTK] Laggy (stuttering) scrolling on the Boisés Est WordPress website's front page carousel

Product:

WebKit

Reporter:

Jeff Fortin <nekohayo>

Component:

WebKitGTK

Assignee:

Nobody <webkit-unassigned>

Status:

NEW

Severity:

Normal

CC:

bugs-noreply

Priority:

Keywords:

Performance

Version:

WebKit Nightly Build

Hardware:

OS:

Linux

URL:

https://web.archive.org/web/20251012232030/https://boisesest.ca/

Bug Depends on:

Bug Blocks:

245783

Attachments:

Description	Flags
Sysprof 49 capture	none
Sysprof capture - screenshot of the Marks view with WebKit marks	none
Sysprof capture - screenshot of the flamegraph OS-wide	none
Sysprof capture - screenshot of the flamegraph - WebKitGTK only	none

Jeff Fortin

Reported 2026-03-26 06:41:38 PDT

To reproduce, /usr/libexec/webkitgtk-6.0/MiniBrowser --private https://web.archive.org/web/20251012232030/https://boisesest.ca/ (or load it in Epiphany stable or TP) …and then scroll up and down the front page's main carousel header. Compared to Firefox, WebKitGTK is very laggy, as can be seen here: https://youtu.be/mwdH5TiTJAM This is on my desktop computer running GNOME 49.5 (Wayland) on Fedora 43 with open source AMD graphics.

Attachments
Sysprof 49 capture (10.79 MB, application/x-xz) 2026-03-26 09:07 PDT, Jeff Fortin	no flags	Details
Sysprof capture - screenshot of the Marks view with WebKit marks (428.44 KB, image/png) 2026-03-26 09:08 PDT, Jeff Fortin	no flags	Details
Sysprof capture - screenshot of the flamegraph OS-wide (330.38 KB, image/png) 2026-03-26 09:09 PDT, Jeff Fortin	no flags	Details
Sysprof capture - screenshot of the flamegraph - WebKitGTK only (364.06 KB, image/png) 2026-03-26 09:10 PDT, Jeff Fortin	no flags	Details
View All Add attachment proposed patch, testcase, etc.

Jeff Fortin

Comment 1 2026-03-26 09:07:43 PDT

Created attachment 478816 [details] Sysprof 49 capture This is a performance profile capture of Fedora 49's MiniBrowser (WebKitGTK 2.50.5) with full debug symbols for everything. The first half of the capture is waiting for the page to load, the second half is me scrolling up and down repeatedly with my discrete mouse wheel.

Jeff Fortin

Comment 2 2026-03-26 09:08:48 PDT

Created attachment 478817 [details] Sysprof capture - screenshot of the Marks view with WebKit marks

Jeff Fortin

Comment 3 2026-03-26 09:09:37 PDT

Created attachment 478818 [details] Sysprof capture - screenshot of the flamegraph OS-wide This screenshot shows everything including not only WebKitGTK but also MiniBrowser itself and GNOME Shell

Jeff Fortin

Comment 4 2026-03-26 09:10:16 PDT

Created attachment 478819 [details] Sysprof capture - screenshot of the flamegraph - WebKitGTK only This is a zoom into the WebKitGTK-specific portion of the flamegraph

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