I noticed that Big Ambitions was taking an eternity to start, save, load, etc. Like - several minutes and I have a good computer. So, I went to the user files on my computer and found the save games.
I am a notorious over-saver - I’ve lost work in the past, so now I save a lot, plus I often use different file names so I have backup points. I also have been playing since early Alphas, Betas and the Demo and have started over at least once with each new major release. The files themselves are pretty small, but it seems that when you load the game, it is loading in all those save games from all versions with their JPG, etc.
I deleted over 60 saved game sessions plus their JPG files, and now the game starts, saves and loads almost instantly again!