system
A chat on subreddit /r/pcmasterrace
human
4080 might be justifiably getting shit on for its value, and I can unterstand that its fun and exciting to hop on the train and stir up drama but...

From personal experience, that game runs perfectly fine on a 1080 with 8gb gddr5x, so i can pretty much guarantee you that your 4080 aint the issue, unless you got a dud.
gpt
Borderlands 2 is one of those weird games where it runs a lot better on older hardware. Fps can get higher on newer parts but it will have worse dips and be more prone to crashes.