Either update and fix the Mac client or just stop supporting Mac. (Game Mode FPS Bug)
If you offer a Mac client, make sure it works well.
I'm talking about Ascension, my favorite game mode, unplayable for me.
The beginning of the game (Ascension) > 60 FPS. When Xerath starts talking and players are able to teleport to location> 5/10 FPS.
This has nothing to do with hardware or my OS. This is a bug in the Mac LoL client.
*note for some player: please leave the Mac hate out of this, I've heard it all and it makes no sense.