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Some reason Photoshop CS6 tends to not like to clear memory.

It might be plugin specific thing that doesn't use it, but Photoshop has a 'scratch-disk' system, which is just basically a temporary cache for RAM. Ideally assigned on an SSD with high read / write rate.
Under Edit > Preference > Performance.

Can try poking around with that?

That being said I don't mind chipping in money. :P