Hi, I recently became an owner of the MacBook Pro 15'' (Mid 2015) i7 2.2ghz, 16gb ram, Iris gpu. Overall performance when doing simple tasks is brilliant. The other day I decided to download Steam and Football Manager 2017. I won't lie. Performance was horrific when FM was running. Whenever the game was processing the whole machine was laggy and unstable. Videos playing in the background were playing at 5fps and minimizing and maximizing windows was also laggy. What can I check to improve performance? Thanks.