Depending on what your old cpu specs were, versus new cpu specs are:
Sometimes going from an older or lower spec cpu to a newer cpu with better specs and performance, player movement and or player speed may seem or appear quicker, etc , in the FPS world. ( can or could be based off gpu, gpu ram/vram , and other things/components being better ) and just takes time getting used to the new setup. One would also be suprised what just a mouse switch changes lol. Took me weeks before getting a new mouse dialed in lmao.
Without any sort of outlined issue like fps drop/loss, or other general ET performance issue makes it difficult to sort.
Any specific issues?