You don't need to manually install Intel drivers. elementary already provides the latest Intel driver that will work correctly with the rest of the hardware stack.
The Intel driver installer from 01.org will not work with elementary OS. They do not support elementary OS and the installer no longer supports the Ubuntu 14.04 base that Freya uses.
Make sure that you're running the latest version of elementary OS. If you installed before September 3rd 2015, then you won't have the new graphics stack included in elementary OS Freya 0.3.1. You should download a fresh copy of elementary OS from our website and perform a clean install to get the best performance.
If you're running the latest version of elementary OS and you're still experiencing performance issues, your computer may simply be too old to run elementary OS.