Mac OSX Ever Since Patch 7.x My Game Freezes if I Don't Move the Mouse

Ever since about patch 7.2 or 7.3, my game has been corrupt in the sense that if I don't move my mouse cursor for about 2 seconds, the game will freeze and be unable to display the current state of the game world. This is especially frustrating given the fact that textual communication is the only form of reliable communication in a game of random people, but taking time to type a message out inadvertently implies that cursor can't be moved. And, as you guessed, the game freezes whenever I try to type any message that take longer that ~2 seconds to type out.

This bug is horrendous to deal with and I can't believe I haven't seen any posts as of recent about it. Can a red please touch base with us Mac users concerning this? A clean reinstall did not solve the problem. Not to stray from the topic so as to degrade the gravity of the post, but for us Mac users as well the LCU beta is laggy still. Even with low-spec mode, in champion select where seconds of decision making matter, the game sometimes gets lagged out and I suffer the chance of being penalized.

Anyways, end rant. Rito pls fix