Ingame Clock. Game running in Slow-mo(best way to describe it)

There are 2 issues as to why I think this.

1. My game clock will slowly fall more behind the longer I play. If I'm on an hour it will be about 2 minutes behind, on 2 hours, 4 minutes, and so on. This affects fate times, it will tell me I have 2 or 4 or 6 minutes longer to complete it than what I really have.
2. I run/ride slower than everyone else, even a person on the same internet as me, in the same house.

Anyone ever experienced or heard of such a thing?

Also its not FPS lag or anything, I run at a consistent 70+ frames per second.

Hey!

By chance, do you know if your CPU is overclocked? Or maybe underclocked?

This is actually something that could cause that kind of problem.

Its currently at stock speed, its funny I actually have the exact same cpu as the other person in this house with the same clock speed set.