You will be waiting a long time. OS X, sporting its extremely robust memory management system handled by the Mach microkernel, will always use almost all of the system memory, as it should. It's a foreign concept given that there are only lesser schemes to compare it to. Performance overall is improved this way. This is a carryover from the NeXT days.
Interesting story that nostalgically came into my mind... I recall when I ran NeXTSTEP for Intel v3.2 on my 486-66 back in '94. I had an ISA-based SCSI board (particularly high performance, back then, the DPT-2021), and you did better performance-wise to go ahead and toggle one bit flag in a settings file, turning on basic compression of the swapfile. It was a simple 2:1 compression. But it took less time for the CPU to take that compressed chunk of swapfile and decompress it (had a 486-66, as I said) than for the SCSI board to move twice the amount of data across the 8MHz, 8-bit ISA bus to memory, uncompressed. Great stuff, details like that. Ahhh...
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