Frequency of lookaside list auto tuning

I know the OS automagically adjusts the depth of lookaside lists, and was wondering if anybody knows how often it does this auto tuning?

I have a driver that after 5 minutes (millions of allocations) still does not seem to get such high allocation hit rates, and am pondering if I should just learn patience or replace the system lookaside list with my own pool. I like the idea of the global memory optimization system lookaside lists give, but perhaps my expectations of their cache hit rate are unrealistic.