There are two problems, one which is pertaining to BL, and one which is going further back: GTX 1080, i7-9700K, 16 Gigs of RAM, D2 runs off an SSD drive. 144hz G-Sync monitor, game capped at @120 to make sure you never skip a rendered frame under normal operation. Settings mostly set to low/medium except for textures and SMAA antialiasing. BL induced roughly 15% frametime increase across the board, with some really nasty frame hitches along the way. The recent update to version 3.0.1 clearly improved some of worst hitches out of the game, but there are still hitches remaining. But the slightly lowered frame rate still applies after BL. The long-term problem is that there's lag in the mouse input model. You can definitely feel this as you are playing the game. 3.0.0 improved upon this by a lot, but the game's input isn't smooth like in Doom Eternal or the like. You can definitely feel some jaggyness and lag in the input. When a hitch occurs, this gets way worse, and you can feel it jar. It would have been okay if this happened on an instance transition, but it can happen in the middle of a world instance all of a sudden, which somewhat perplexes me. Shouldn't everything have been loaded by then?