On 22 Jul 2013, at 7:56 AM, Martin Percossi <mperco...@zenaud.io> wrote:
> 1. I have a layer-backed view as the content of a page within a
> NSPageController. Everything works fine, however, compared to a simple
> layer-backed, empty, (blue background via self.layer.backgroundColor)
> NSView, the swipe animation kicks in very late. It's as if the
> snapshot taken by the private code within NSPageController takes a
> long time to complete. Does anyone knows why this could be occurring?
> My "complicated" layer-backed view contains multiple layer-backed
> subviews with transparencies, shadows, etc. In addition, it uses
> drawRect: to draw gridlines. It should be noted that under normal
> operation (i.e. when not history-swiping), I'm getting frame rates
> between 40-60fps -- so the drawing and subview positioning is probably
> not the bottleneck.
"Probably not the bottleneck" is not an encouraging thing to hear. You should
know where the bottleneck is, without having to assign probabilities. Use the
Time Profiler instrument to get the real answer. It will usually surprise you.
If it really is a matter of compositing the page content, look hard at how much
of it can be replaced with hosted CALayers, or replacing views and layers with
drawing into their containers directly.
Having very large numbers of NSViews smells like a performance issue. You say
that the view composites very quickly when it stands alone, but I'd expect
pushing the composite through the transformations and effects of page turns to
be much, much slower. But now I'm assigning probabilities, which I just said
should be avoided.
If you get deep into the weeds of graphics performance, you might want to look
into quartz-...@lists.apple.com.
I'm sorry I can't answer your other questions.
— F
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