Linux speed hacks
Install an application called prefetch which preloads commonly used files.
It may take a few days for the program to learn your preferences so be patient. soon you will notice a significant boost in speed for your most commonly used applications.
Note: Prefetch has been renamed to preload
sudo apt-get install preload
If you have a lot of RAM you can store your /tmp folder within RAM,
sudo nano /etc/fstab
add this line to the bottom
none /tmp tmpfs defaults 0 0
WARNING THIS WILL BREAK SUSPEND
Use the Google Public DNS servers
sudo echo nameserver 184.108.40.206 >> /etc/resolvconf/resolv.conf.d/base &&sudo echo nameserver 220.127.116.11 >> /etc/resolvconf/resolv.conf.d/base && sudo service networking restart