~100ms input lag on keyboard and mouse

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My keyboard and mouse are behaving strangely.
I recently upgraded my PC (new and old specs listed below). I have found that when using my new components my keyboard and mouse have considerable input lag but only when using a certain game called “osu!’. Other games do not have the same input lag on my new setup, my old setup had no noticable input lag on any game. Does anyone know what could be going on?

Old specs:
Intel i5 4690k
Asus H81M-plus motherboard
2x4GB RAM
2 Terabyte hard drive…

~100ms input lag on keyboard and mouse

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