Should I cap my FPS?

After tons of FPS optimisations I have gotten past the 100 FPS mark, around 120-150. But when ults like KJ, Harbor, Viper come out, my FPS drops below 100. Sometimes it goes to 70-80 which is very noticeable. I tried capping my FPS to 90 but sometimes my FPS straight up goes below 90 and chills out at 85-ish for a few seconds. So does capping FPS help or should I be like most people and just uncap my FPS?
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