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This article says you can have increased performance in Linux with zRam (virtual swap compressed in RAM).

I have 4 GB of RAM , 2.93 GHz (Dual Core) & I use virtualization a lot (VMWare). Would it be helpful to my computer's performance to install zRam? I'm using Ubuntu 11.10 as my host and a VMWare workstation for virtualization .

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& how do i know that zRam is working or not – One Zero Nov 18 '11 at 7:35

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I'm using it on Oneiric and have not found any problem yet. You should give it a try, and see if the performance is better. Virtualization is one of their use cases. But bear in mind that to give that "extra memory" effect, pages are compressed, which requires cpu power.

To see if it is running, use service zramswap status

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zramswap start/running – One Zero Nov 26 '11 at 14:21
My question was it really work as it says – One Zero Nov 26 '11 at 14:22
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As i said, it depends of the use you give to vm's. If you use vm's to run cpu intensive tasks, the extra cpu power needed to compress the pages could not improve performance at all. In my system, i feel that it is a lot more responsible when the swap memory begins to be used. – Salem Nov 26 '11 at 14:38

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