If you have old PC/Laptop or low memory machine and want to install Ubuntu, here is how to increase overall performance. The trick is to install zRam which increase the performance by make use of more ram instead of slow swap disk .
zRam was previously called compcache and create compressed block device in RAM to avoid unnecessary disk paging. This is very useful for low-end computers or devices with flash memories.
zRam is available to install via ppa for Ubuntu 11.04, 11.10 and 12.04 LTS:
Just execute the commands in terminal:
sudo add-apt-repository ppa:shnatsel/zram
sudo apt-get update
sudo apt-get install zramswap-enabler
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