You gotta bypass the 2k Launcher to immediately improve performance massively. Which you need to do with all their games and is clearly the publisher's fault considering it applies across the board. Luckily its literally a two step easy process to do. The load times are still ridiculous, but after doing that I had zero further issues.

And its probably the only non-"roguelike" Slay the Spire clone I've seen, which puts it head and shoulders above basically all of them as it allows it to be played with a completely different mindset, one that is basically just like Xcom in terms of team building and not treating every battle as a long string of mistakes but as singular units. Heck it feels closer to Into the Breach than StS.