How to optimize Fedora?

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http://forums.fedoraforum.org – Hi everyone, Recently I've been doing some rather intensive stuff on my system, which makes Blender regularly use 1.5-2.3 gigs of RAM. This worries me a bit because I've only got 3GB installed :C So my question is, how can I get Fedora to use less RAM? ATM it uses about 300MB... Any advice is appreciated :) (and no, buying more memory isn't an option until I get a job. Which is a few weeks away :() (HowTos)