Increasing Virtual Memory on a Mac

Reset your Mac's parameter random access memory (PRAM) and nonvolatile random access memory (NVRAM). Press and hold the 'Command,' 'Option' and letters 'P' and 'R' on your Mac keyboard as you start the computer. Listen for the second set of chimes and release.
Free additional disk space on your boot volume. VM on a Mac requires free disk space on your startup disk. If your startup disk is nearly full, your Mac's performance will be degraded. Delete files you no longer need. Movies take up a lot of drive space, which makes them good candidates to delete.
Consider installing a larger hard drive in your Mac. If you cannot find enough files to delete on your boot drive, it may be time for a larger drive. It is best to consult with an expert or Apple Genius for this delicate process.
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