How to Optimise Stormworks:

Step 1: delete stormworks


Step 2: Refund the game


Step 3: the game is so buggy you can't optimise so your better off uninstalling


Step 4:Go outside


Conclusion: You can't optimise stormworks because the developers are too lazy to actually fix their game and instead create updates in the form of dlc to farm money from you...

Honestly just better to refund this broken game and play an actual working vehicle sandbox, like scrap mechanic or even trail makers.