i updated steam in my PC version today and found some new setting options, i changed two items and found the game runs much more smoothly afterwards
1, Update your stream
2, go setting>In-game. Then “un-tick” Enable the steam overlay while in-game
3, go setting>In-home streaming. Then “un-tick” Enable streaming
I think this will stop the steam received/ exchange net information while you are playing. hope it helps