Revisiting Doom 2016, but now it's unplayable

[I kill Bunnies]

OK so I did a play through a year or so ago and decided to revisit recently to play again on a harder setting.

However now the game is unplayable! The FPS drops are insane, constantly going from 120 to 30. The game feels like I'm walking in glue.

I am playing at 1440 with a 10700K and 5700xt which was fine last time around.

Anyone else have these problems or know a way around it?

 

[I kill Bunnies]

Well I switched from OpenGL to Vulkan and that seems to have fixed everything. Game runs smooth now!