[Webkit-unassigned] [Bug 256454] New: [GTK] moving mouse around in YouTube fullscreen mode causes significant jump in CPU usage

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=256454

            Bug ID: 256454
           Summary: [GTK] moving mouse around in YouTube fullscreen mode
                    causes significant jump in CPU usage
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKitGTK
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: kdwkleung at protonmail.com
                CC: bugs-noreply at webkitgtk.org

Created attachment 466271

  --> https://bugs.webkit.org/attachment.cgi?id=466271&action=review

Screencast showing CPU usage when moving mouse VS when playing video

Moving the mouse around in a fullscreen YouTube video to show the player controls increases the CPU usage by about 5 times as when just playing the video with DMABUF sink. Might be related: the YouTube header bar (with YouTube logo and search bar) doesn't show after exiting fullscreen mode and the console output says WebProcess crashed (even though I can still use the website).

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