FH4 Unplayable (lag)

This has been happening for a week or so but whenever I drive around my game gets massive lag spikes (I drop to like 2 fps).

Also, I know my problem isn’t gpu related because my its usage seems to stay at around 50-60% at high graphics;
Also also I’m pretty sure this is a cpu render issue since in benchmarks that has a minimum of around 1 fps.

Specs:

Intel i5 6400 @ 2.70 GHz
8GB ram (idk clock speed)
AMD Radeon RX 470