I figured out my issue, its the resolution on my new monitor. My new monitor has a resolution of 3840 x 2160 and that causes frame drops in D2 for whatever reason. I dont want to change this because I paid for this monitor to use the whole thing, not to have D2 windowed to half my monitor and trying to play like that. I really do understand that making games is hard and im really trying to be nice but please for the love of god Bungie fix your shit. I love you but this has gone on for so long now and I just want good frames.