Have you upgraded to the newest Apple OSX Release?
Apple released the newest version of OSX named El Capitan. This new OSX version offers a couple of different upgrades such as the Split View, which allows you to work in mulitple apps at the same time. It suppose to also provide a better graphics performance for games and high performance apps.
If you need help upgrading or want our opinion before you install the upgrade, give us a call 303-293-8100