[Webkit-unassigned] [Bug 83499] New: [BlackBerry] requestAnimationFrame performance choppy & inconsistent

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=83499

           Summary: [BlackBerry] requestAnimationFrame performance choppy
                    & inconsistent
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: WebKit BlackBerry
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: anlo at rim.com
                CC: tonikitoo at webkit.org


Reproduction:
1. http://webstuff.nfshost.com/anim-timing/raftime.html
2. Slide delay slider to the right to add delay to each frame.

Notice that when moving the slider slightly, performance becomes extremely
choppy. Much choppier than it should be given the reported FPS. Also much
choppier than it should be given the delay.

When you slide the delay slider, it should get choppier since you are lowering
frame rate. However, the choppiness should be consistent, meaning the same time
interval between frames. The bug is that it is inconsistent and stutters.

When this is performing correctly, it should transition smoothly to being more
choppy as you move the slider to the right. The FPS should reflect the amount
of choppiness you see, and the choppiness should be consistent.

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