Out of curiosity, I reformatted my 256MB SD card (actually a microSD with adapter) to be NTFS and enabled file compression on the drive. Before, the drive would only hold a 232MB cache file. Now with encryption I can bump that a lot up to 300ish although I'd rather not find out what would happen if a cache rebuild with a lower compression ratio tries to fit in there. As a compromise, I put a 256MB file on there and eBoostr states there is 306MB available of 241MB total. XD
But I digress.
Before turning on file compression eBoostr's random read speed would be approximately 7MB/s. Now, it wanders between 8.5MB/s to 14MB/s. A improvement overall at the cost of processor time and decompression overhead. Nevertheless, after watching Resource Monitor's CPU page during a cache rebuild with my 2.53GHz P8700 locked to 800MHz through RMClock, CPU usage didn't really go up more than 2%.