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How much memory does your machine have? It sounds like it may not have enough. Try a purge all when this starts happening and see if that helps.
I didn't think to do a purge, I'll try that next time it happens.
After a lot of experimentation, I've noticed the problem seems to occur when I'm cloning from adjacent frames. So for example I clone from frame 1 - 2, then from 2-3 and so on. By the time I'm at frame 10 or so, it will start to freeze.
For now, I'm avoiding doing that and hence haven't really run into the problem.
The machines I'm using all have 4GB RAM.
Ahh. Clone chains like that can occasionally need to get the whole chain into memory at once.
If it happens again, fire up Activity Monitor and check the system memory tab to see if Page Outs is cranking up. That would imply memory stress.
yes, page outs has just gone from around 700 or so to 865 -- and AE is still unresponsive. I've only done a dozen or so paint strokes across 3 frames this time. Is there anything I can do to improve the performance?
If you're going to do this kind of work on a regular basis, you desperately need more memory. 4 gigs is NOTHING to AE 10.
I run AE 10 on a dual quad-core, it has 24GB RAM, and if I could have afforded more, I would have gotten more. Kapiche?