@Riot New Gamemode Very Labor Intensive on Comp

I don't know if this is something a lot of people are going through. This gamemode is super fun but unfortunately, my computer goes from a normal CPU speed to an unreasonable amount in game. I have a fairly decent computer as well and nothing is running. I never really have problems in normal rift and when I go into here I am in the high range of numbers CPU speed and strength. Is there a bug or something?