Bug 278692

Summary:

[GTK] Slow scrolling on Hotels.com search results listings

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

Bug Depends on:

Bug Blocks:

245783, 268972

Attachments:

Description	Flags
Sysprof 47 capture with Epiphany 47	none
Sysprof 47 flame graph	none
Sysprof 47 compositor marks	none
Sysprof 51 capture with Epiphany 51 and WebKitGTK 2.54 - filter to 45 seconds	none
Sysprof 51 flamegraph (WebKitGTK 2.54)	none
Sysprof 51 marks part 1 (GNOME compositor)	none
Sysprof 51 marks part 2 (WebKit)	none

Jeff Fortin

Reported 2024-08-26 19:27:55 PDT

On any computer (with Intel Kabylake graphics on Wayland, and open source AMD radeon R9 270 graphics on Wayland), with MiniBrowser and Epiphany TP (nightly flatpak), when scrolling through any search results on Hotels.com (ex: search for hotels in New York City for one or two guests for one night on some calendar date a couple months in the future), I am observing: * Sluggish janky scroll performance as images load, with Epiphany TP (Vulkan Intel and nGL radeon) and MiniBrowser * Epiphany TP (Skia, WebKitGTK 2.45.90 + GStreamer 1.24.7 + GTK 4.15.6) unloads the images as you scroll down, i.e. if you scroll back up they will have to load again; MiniBrowser does not seem to unload images once they're loaded, however. This sounds similar to https://gitlab.gnome.org/GNOME/epiphany/-/issues/1956 but in this case here I do *not* have the "Website Data Storage" setting turned off in Epiphany. Epiphany 46.3 (WebKitGTK 2.44.2 + GStreamer 1.24.7) does not seem to unload the images, only TP does.

Attachments
Sysprof 47 capture with Epiphany 47 (4.26 MB, application/x-xz) 2024-09-27 11:35 PDT, Jeff Fortin	no flags	Details
Sysprof 47 flame graph (662.51 KB, image/png) 2024-09-27 11:36 PDT, Jeff Fortin	no flags	Details
Sysprof 47 compositor marks (446.60 KB, image/png) 2024-09-27 11:37 PDT, Jeff Fortin	no flags	Details
Sysprof 51 capture with Epiphany 51 and WebKitGTK 2.54 - filter to 45 seconds (59.13 MB, application/x-xz) 2026-09-20 10:39 PDT, Jeff Fortin	no flags	Details
Sysprof 51 flamegraph (WebKitGTK 2.54) (881.12 KB, image/png) 2026-09-20 10:50 PDT, Jeff Fortin	no flags	Details
Sysprof 51 marks part 1 (GNOME compositor) (297.33 KB, image/png) 2026-09-20 10:51 PDT, Jeff Fortin	no flags	Details
Sysprof 51 marks part 2 (WebKit) (291.87 KB, image/png) 2026-09-20 10:51 PDT, Jeff Fortin	no flags	Details
Show Obsolete (3) View All Add attachment proposed patch, testcase, etc.

Jeff Fortin

Comment 1 2024-08-26 20:23:21 PDT

Demonstration video with Epiphany TP: https://youtu.be/JU9dWKampmI

Jeff Fortin

Comment 2 2024-09-27 11:35:37 PDT

Created attachment 472706 [details] Sysprof 47 capture with Epiphany 47

Jeff Fortin

Comment 3 2024-09-27 11:36:29 PDT

Created attachment 472707 [details] Sysprof 47 flame graph

Jeff Fortin

Comment 4 2024-09-27 11:37:06 PDT

Created attachment 472708 [details] Sysprof 47 compositor marks

Jeff Fortin

Comment 5 2026-09-20 10:35:15 PDT

Testing again with Epiphany 51 and WebKitGTK 2.54.0 on Fedora 44 today, I can see that the images no longer unload themselves (they stay loaded when scrolling back up), but the scrolling remains not smooth, especially compared to Firefox and Chromium that both manage to scroll across the fully loaded page at what feels like smooth 60fps, even on a 4K display. Will attach up-to-date Sysprof captures with full webkit debug symbols and marks.

Jeff Fortin

Comment 6 2026-09-20 10:39:15 PDT

Created attachment 481442 [details] Sysprof 51 capture with Epiphany 51 and WebKitGTK 2.54 - filter to 45 seconds When viewing this capture, filter the timeline to 45 seconds and beyond (to see only the scrolling, not the loading of the page contents).

Jeff Fortin

Comment 7 2026-09-20 10:50:18 PDT

Created attachment 481443 [details] Sysprof 51 flamegraph (WebKitGTK 2.54)

Jeff Fortin

Comment 8 2026-09-20 10:51:14 PDT

Created attachment 481444 [details] Sysprof 51 marks part 1 (GNOME compositor)

Jeff Fortin

Comment 9 2026-09-20 10:51:43 PDT

Created attachment 481445 [details] Sysprof 51 marks part 2 (WebKit)

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