Most likely it's related to the "Sync to VBlank"
First - make sure you have CCSM installed. If not, then from a terminal type
sudo apt-get install compizconfig-settings-manager
Second - After it's done installing, click on the Unity launcher button in the top left and type ccsm and then hit enter
Third - With CCSM open, in the General area, click on OpenGL and UNCHECK the "Sync to VBlank"
Fourth - Click on Back at the bottom to go back to the main ccsm menu, then click on Composite and UNCHECK Detect Refresh Rate and drag the Refresh Rate slider all the way to 200