Graphics "lagspikes" in the new Summoner's Rift.

For some reason, the new Summoner's Rift is causing weird graphics spikes on my computer which should be far better in every way, than are the max requirements to run the game. I never had any graphics or lag issues in the old Summoner's Rift and I still don't in ARAM or other game modes, where the old maps exist, but the new Summoner's Rift gives me very annoying spikes whenever there's something happening on the screen and even this is situational. On bot lane it happens far less often, but mid lane the spikes are real whenever the enemy and I start throwing spells. I also tried to run it with different qualities ranging from the highest to the lowest and it appears no matter the quality.

What is wrong with your graphics code or whatever is causing this? It's making the game that I love unplayable.