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Why does 12.10 not release cache?

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http://askubuntu.com – Since upgrading to Kubuntu 12.10 I am experiencing huge slowdown after a couple of days of uptime. The problem is that ubuntu is not releasing cached RAM as expected. I have 8Gb of RAM of which only 1.5 are used, the rest is cache. @~$ free -m total used free shared buffers cached Mem: 8025 7743 281 0 14 6016 -/+ buffers/cache: 1712 6312 Swap: 9535 2902 6633 drop_caches does nothing: sudo echo 3 | sudo tee /proc/sys/vm/drop_caches And all other variants with manipulating dr (HowTos)