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depends
If you're at the RAM ceiling and the disk is thrashing as OS X decides what part of the mutli-gigabyte disk cache to write out, purge can be very useful to speed things up. Blindly clicking purge without knowing the RAM status can also be silly, though.
depends
per this person's device, evidence that you may need to purge would be having greater than half of your memory listed as Inactive:
Disk Utility
Somewhere along the line I found a suggestion that clears out that inactive memory problem. Seems every morning my inactive memory is a huge chunk of total memory.
Disk Utility
I doubt Disk Utility is doing anything directly to memory. More likely, it's using a bunch of memory, which causes things to get flushed out. ---
EMOJO: mojo no longer workin'
Disk Utility
'mds' can and does grow extremely large, memory wise. As Spotlight indexes files the files are opened.
You can also create a simple file like this
save it as 'purge.command' someplace, click on the spotlight search, type 'purge.command' followed by a return, an poof, command runs in terminal.
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