I run a dual boot pc with windows 7 and ubuntu 16.04 running an intel core i5(4th gen) processor with 8 GB ram and intel HD graphics 4400.
Now Dota 2 runs just fine on windows but lags like hell on ubuntu. I think it might be because i haven't installed any drivers.
Consider me a novice so avoid any unstable drivers which might break something.
I had some similar problems related to FPS. I also have Intel graphics. The main problem is related to the compositor. Try disabling the compositor and run Dota again, you will notice a much better performance. On the other hand, try to reduce the render quality and the video options of the game.
For information about disabling compositing, read this thread:
Enjoy!
