FCP X is just as tetchy with Snow Leopard as it is with Lion

I did a clean install of Snow Leopard on one of my internal drives.
Now I have the choice of Lion or Snow Leopard to run FCP X (installed it on both).
So far, I can see no improvement at all with FCP X on SL.
Can anybody suggest an operation that runs better with Snow Leopard?
Andy

For some reason FCPX runs much better with Snow than Lion on my old Mac Pro. If I understand your question right, rendering is faster, it opens faster, there is no stuttering and I always use playback: High Quality, it never crashes.  And I have no memory leak, on the contrary FCPX only uses 4-5 GB. I have another volume with Lion and FCPX and an can clearly see the difference when I switch. But I have no clue what is going on. Maybe my computer likes Snow better.

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