League of Legends running bad on high end pc

Hello, so i've had this problem for quite a while ever since I upgraded my Graphics card actually. When I play league the client is EXTREMELY laggy especially when I have to ban a champion or make runes. When i'm in game i'm running with 100-140 fps sometimes it goes even lower. It even causes Discord to crash sometimes. When I'm playing other games it runs smoothly with no problems, I dont have any issues with Discord either only in League. I've found a lot of other discussions about this topic but I've not really found a solution to it. Does anyone have a fix for this? Specs: CPU: i7 6700 GPU: GTX 1080 Ram: 12GB DDR4
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