[Webkit-unassigned] [Bug 250998] New: [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

            Bug ID: 250998
           Summary: [GTK] Very slow scrolling on Apple's product pages on
                    4K HiDPI displays
           Product: WebKit
           Version: Other
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKitGTK
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: nekohayo at gmail.com
                CC: bugs-noreply at webkitgtk.org

https://www.apple.com/mac-pro/ is a good test case for scrolling. Already on normal machines it is not butter smooth, but on HiDPI machines it's near (or completely) unusable.

Regardless of Xorg vs Wayland, Epiphany 43 vs 44 "technology preview", font scaling at 1.00 vs 1.15, and any Epiphany settings, the machines where the issue occurs an order of magnitude worse are the ones that are running a HiDPI 4K display (ex: at 2x global scale factor). On those machines, it's a 0.5 fps slide show. The issue is more pronounced when two-finger scrolling with a touchpad than when using a mouse's scrollwheel, but even the mouse method will be unusable.

Firefox and Chrome are butter-smooth on that same display/machine (which sports an 8th-generation Intel Core i7 (Kabylake), 16 GB of RAM, NVMe SSD, and Intel graphics).

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