hmm LW program does not take up that much space. On my old computer at one point moved my iTunes library to a different drive, then an external drive. On my new computer it has it's own special partition with 720 GB capacity so no quick chance of running out of space.

OSX needs space for virtual memory. All OSX programs use VM, so I try to avail all possible space on my system drive. That includes installing whatever programs I can on other drives & do not use the system drive/personal account folder for saving files to. This also keeps the system disk drive reading/writing only for the system. But that's just my approach. Used that approach for quite a few years now.