Does anyone really understand what this is trying to say? I have played with this setting up and down and can find no difference in processing cubes.
From the Help file on the AS Server Properties Environment tab:
Memory conservation threshold
Set the memory threshold near which memory usage decreases. When the amount of memory used by Analysis Services approaches this threshold, usage decreases as memory management becomes more efficient. Actual memory usage may exceed this value unless the default value is used.
Default: all of server computer's memory.