There's a method to examining why the save file is so big (which causes the slow times).
This is a long thread and I might have missed it, but during the game you can:
1.Hit the keyboard key "~". Then it asks you to press enter if you want to input on the top left of the screen.
2.Hit "Enter". Then it gives you a prompt to write text/cheats
3.Hit "AuditSaveGame" and it will open up an excel with the explained contents of the save game size
The first part is the MobileObjects.save (things left behind) and the other part (the latter one after LEVEL DATA) is the current level data.
Hope it helps
