[Webkit-unassigned] [Bug 211325] New: [GTK] Epiphany scrolling behaviour change with AC mode

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=211325

            Bug ID: 211325
           Summary: [GTK] Epiphany scrolling behaviour change with AC mode
           Product: WebKit
           Version: WebKit Local Build
          Hardware: PC
                OS: Linux
            Status: NEW
          Keywords: Gtk
          Severity: Normal
          Priority: P3
         Component: WebKitGTK
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: aakash.kapoor at pm.me
                CC: bugs-noreply at webkitgtk.org

Tested using Epiphany 3.36.1 with WebKitGTK 2.28.2 and WebKitGTK 2.28.0 on Fedora 32. Using Nouveau graphics with default settings done by Fedora.

With WEBKIT_FORCE_COMPOSITING_MODE=1, the scrolling behaviour is fast but abrupt and does not have kinetic scroll.
With WEBKIT_DISABLE_COMPOSITING_MODE=1, the scrolling behaviour is slower but has kinetic scroll. 

On default behaviour without setting any of the above environmnent variables, scrolling is stuttery, lacks kinetic scroll and upon the use of Web Inspector, reveals high CPU usage with most of it being spent on Styles Invalidated and Styles Recalculated (an example website for this was macrumors.com). Websites where the above two things aren't happening (eg. phoronix.com) have smoother scrolling.

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