This new update pushed you back to when you started first designing this game. Remember when large save files made the game unplayable? Well this time I have a not so large file. Just one base on only one planet. (The first one) with about 13 rtgs of power and 10 medium batteries. The FPS drop is terrible. I cannot play this game as it is. You guys need to re-optimize this fast. I wont be back till you fix it. This was in creative mode.
According to the Astroneer subreddit, there seems to be a bug with the medium soil canisters which is causing performace drop on Xbox One and PC. If you remove any medium soil canisters you have stored on rovers or platforms and disable the canister output it seems to improve things.
See here: Astroneer sub-reddit
I was down to below 10 fps after the automation update, after removing all my medium soil canisters in my main base the fps rose to 30 fps. After I removed them from the bases on other planets I was up to 40 fps. Still not great but at least it's playable again.