[Webkit-unassigned] [Bug 109504] New: Autoscrolling FPS should be close to monitor refresh rate (~60 FPS, not 20 FPS)

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=109504

           Summary: Autoscrolling FPS should be close to monitor refresh
                    rate (~60 FPS, not 20 FPS)
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Event Handling
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: nils at wlonk.com


Autoscroll/panscroll ("middle-click scroll") runs at 20 FPS. This looks bad when autoscrolling slowly.

Autoscroll, like other animations, should run at the refresh rate, as suggested by Google's Jank Busters initiative.

Other browsers, such as Firefox and Opera, already do this. It is possible to replicate their behavior with client-side javascript.

Originally, the autoscroll interval was 0.1s (!). In response to rdar://problem/6080639, revision 35274 cut that in half, where it remains today.

Previously reported as https://code.google.com/p/chromium/issues/detail?id=163788

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