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Is it possible that there is a large hint in the description you have quoted?
Performance implies speed, whilst memory implies sacrifice of performance to maximise availability of memory.
Why don't you run a test and see for yourself what differences there might be and then post the results so everyone can share the knowledge?
When I select "Optimize rendering for Memory", it renders a lot faster than when I select Performance.
>Now what I want to know is which will give you the fastest rendering times?
Best way to tell is to render the same sequence both ways with a stopwatch.
See that's what I though at first. But when I switch to memory I too appear to see faster rendering times as well.
But you would think that Memory would be the slower safer option.
So I was wondering what exactly is optimized and sacrificed for both for some more insight.
You don't say how many processors you have, but the rule of thumb I've heard is that you should have 2GB of memory installed for each processor to achieve best performance. Actually, that recommendation comes from Nucleo Pro, an After Effects plug-in for advanced multi-processor rendering, so it may or may not apply in your case.
And Nucleo possibly supports 64 bits, whereas Adobe is just a 32 bit application.
Any 32 bit application will choke on memory shortage with 8 or more cores.
Asus A8n32 sli deluxe
Amd 4600 64 x2 (dual core)
Nvidia 8800GTS 640mb
Xp 64 pro
And Harm - I hope Nucleo Pro comes out for Adobe Premiere as well.