ok, so ive made some clips and run some initial tests to get an idea of how we could do this.
it seems that the contents of the file is irrelevant as i got the same frame rates with 20 layers of minimal graphics video ( text video ) as i did for 20 layers of video footage ( skate video ) - see attached images for screenshots of both ( this surprised me as i expected 2 colour imple video to use less resources than real video footage )
it also doesnt seem to make any difference if i use 1 video loaded 20 times or 20 copys of the same video - again i get the same frame rates for both
because of this i suggest that i just upload 1 clip in 3 sizes and that there will be no need to duplicate the clip for the test - you can just load the same clip multiple times.

- text video
- text video.jpg (44.6 KiB) Viewed 156 times

- skate video
- skate video.jpg (89.1 KiB) Viewed 156 times
so, for the benchmarking i suggest we make three 20 layer composition's - one composition for each video size ( 640x480, 1024x768, 1280x720 ) we then load the relevant clip 20 times ( once on each layer ) and state what the frame rate is. we will also need to state computer type / model, cpu type / speed, graphics card type including amount of graphics memory, hard drive type and speed and the amount of system ram.
the aim will not be to boast who has the best computer, but to give a good view of what machines are capable of, which will hopefully help anyone looking to buy a machine to run Avenue

how does this sound? have i missed anything essential? if there are no objections or further suggestions, i will start a fresh thread for the results.