Hi!
Here's the thing--I've noticed that some of the simplest animations in
QC seem to suck up an enormous amount of CPU time, for what little
they appear to do. If this was my own code, I'd know how to fix it.
But with things like the interpolator, I'm not entirely clear how I
should even start to fix things like this. Any suggestions would be
greatly appreciated!
So I did some experimenting. What this video shows are the areas I'm
most concerned with...
http://www.conjurebunny.com/QuartzCompositionCPUUsage.mov
I have a simple composition that draws some lines, and uses a single
interpolator to move the lines around.
At the start, I have 8.5% of my CPU time taken up by the interpolator.
It's set to have a duration of '2'. Which yields a really, really fast
animation.
When I remove the connection to the interpolator, the CPU time drops
to 0.3 % or so. Which is expected. No mysteries there!
Next I wire it back up, and bump the duration to an incredibly high
number. Now I have the same CPU % usage that I had before! That's the
first thing that doesn't make sense. I would have expected it to at
least use less CPU time, as the duration increases.
Does this mean that the QC runs on some internal timer that runs at a
fixed rate? If so, can I alter the speed of the internal timer?
Marching on...
Next I wire up the interpolator to three other sets of lines. The CPU
time jumps up to a much higher number. Remember though, the
interpolator is still set to a really high number.
After this is done, the CPU time sticks around 25%.
And I can kinda understand it up to this point, assuming there's some
internal timer that is used that is independent of everything else.
But...
The last thing I do is set the interpolator back to '2'.
The CPU time drops back down to around 1% faster than it was at the
very beginning (around 8.7 - 9.5 % CPU time), when it only had one
set of lines to draw.
That makes no sense to me. Why would it use MORE CPU time if it's
generating less, and less time when it is generating more?
Any suggestions greatly appreciated!
Thank you!
-Chilton
ConjureBunny.com
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