it's also related to bug:
https://bugs.launchpad.net/bugs/941673
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https://bugs.launchpad.net/bugs/1026325
Title:
[Precise] Unity-greeter using 45% of memory upon boot and it may go up
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https://bugs.launchpad.net/bugs/1026325
Title:
[Precise] Unity-greeter using 45% of memory upon boot and it may go up
to a 100% on certain conditions
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