[Webkit-unassigned] [Bug 250998] [GTK] Very slow scrolling on Apple's product pages on 4K HiDPI displays

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=250998

--- Comment #1 from Jeff Fortin <nekohayo at gmail.com> ---
Created attachment 464639

  --> https://bugs.webkit.org/attachment.cgi?id=464639&action=review

sysprof capture of epiphany nightly from 2023-01-24

As suggested by Christian Hergert, attached here is a sysprof capture of the flatpaked Epiphany 44 nightly trying to scroll that page up and down, lagging in various places (especially in the middle in areas where they reveal the motherboard and other components in the case).

This is recorded with GNOME Shell 43.2 (Wayland version), Mutter 43.2, Mesa 22.3.2, OpenGL 4.6 / OpenGL ES 3.2 / EGL 1.5.

The GPU is "Intel UHD Graphics 620 (rev 07)" accompanying an Intel Core™ i7-8550U (Kabylake). Technically GNOME Control Center's "Details" panel seems to say there are two GPUs on the system ("NV138 / Mesa Intel® UHD Graphics 620 (KBL GT2)"), but I don't think that the "NV138" is ever used anywhere (or I have no way to know if that's the case, and GPUViewer only sees the Intel GPU anyway). I haven't installed any particular drivers, this is all stock Fedora 37.

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