I have a Mid 2015 15 inch Retina mac book. It has a 2.5 GHz Intel Core i7, 16 GB 1600MHZ DDR3 ram, and AMD radeon R9 m370x 2 GB graphics. It mostly runs fine, but at the start of team fights, it will freeze for a second, which is really frustrating. I've tried running on lower setting/switching to Vulkan, but it still happens. I can't confirm, but I think it happens when new animations are played that haven't been played yet. Let me know if there is anything I can do.