Jayce bug

Dear riot, me and a lot of my friends have a bug that whenever jayce uses his R we all lose fps. a friend of mine has stable 140 fps and when jayce ults it goes down to 60 if he's alone and 30 in team fights. could you please fix this bug? i just bought jayce and i really enjoy playing him but now i can't, also each game we have to ban jayce or we can't play. thank you, people who play this game.
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