[Webkit-unassigned] [Bug 208249] New: With Epiphany, mouse hovers across the emails list in GMail is noticeably slower than Firefox

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https://bugs.webkit.org/show_bug.cgi?id=208249

            Bug ID: 208249
           Summary: With Epiphany, mouse hovers across the emails list in
                    GMail is noticeably slower than Firefox
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Other
                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

I'm not sure if this WebkitGtk-specific, or Epiphany-specific, or anything of the sort, I'm just reporting what I'm noticing here with Epiphany 3.34.4 and WebKitGTK 2.26.4 on Fedora 31 (GNOME xorg session): Epiphany is noticeably slower than Firefox on Google web applications, particularly GMail.

The case here is fairly easy to reproduce: open a well-filled GMail inbox with Epiphany on one half of the screen, and Firefox (I'm currently using version 69, so not even the latest/greatest) on the other half of the screen. Note that my GMail inbox's density is set to "Compact", if that changes anything.

Then, move the mouse rapidly and repeatedly up and down across the messages list.
You will notice that the individual email items "highlights" are super smooth on Firefox, but laggy in Epiphany (the highlights trail with noticeable delay behind the mouse cursor).

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