http://www.pvladov.com/2013/01/i ... cs-performance.html
Increase the amount of RAM and make it work in dual channel mode
Integrated graphics cards usually do not have their own memory (or only have a small amount of one). They take memory from the RAM of the computer. When your computer has more RAM the Intel HD Graphics will be able to utilize more memory. But what will really speed it up will be using two memory sticks of the same capacity and speed. In this case you computer's RAM will begin to work in dual channel mode which means that it will become at least 15% faster. As the integrated graphics use computer's RAM extensively you can expect an even greater performance improvement for your Intel HD Graphics - it will become 20 - 25% faster in most applications and games.