For Honor Low Fps For No Reason

Specs:
RX 580 4gb
i5-8400
8gb ram
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I used to play on max settings just fine, but after not playing for a month and coming back to it since it got free and some of my friends got it, I'm getting no more than 15 fps on the lowest settings and can't join anyone's party.

GTA 5: Max settings, 80+ fps
6Siege: Max settings, 90+ fps
Overwatch: Max settings, 80+ fps
Fortnite: Max setings, 80+ fps

This only happens to For Honor AND Destiny 2 (Bungie)
I'm thinking that it's not using my graphics card, but I'm not sure how to force it.
I've contacted the Ubisoft support, but hey, it's just as bad as their games.