Starting a new map, pressing play, scrolling quickly around the map at results in major stuttering. Doesn't really bring FPS down at all. I created about 10 different saves to test the issue. It's definitely something to do with the latest version of the game.
Using a guide to convert to an older version of the game with steamDB, version 366134 (just picked a random one from a couple months ago) fixes the issue. I am going to play on this version for the time being.
Creating a new game. (Loading older maps that was created on older versions of the game does not have the same issue. Issue only persists on maps made on the newer client)