Hi,
I can’t really help with this, except to point to Gunnar’s blogs: http://blog.qt.digia.com/blog/author/gunnar/
One possibility: if something is happening in the animation which requires (every so often) a whole heap of GL draw calls to be uploaded to the GPU, that could be causing the huge 100ms spike. You could try using the overlap renderer or something, to try to optimise this.
Otherwise, just talk to Gunnar (gunnar or sletta) or Samuel Roedal (capisce) on #qt-labs irc.
Cheers,
Chris.
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