well if you select an model and look in the channel box yo0u should have an endless list of performed commands to get to that model! this list isnt needed anymore..or do you want to change options of the second done "exturde face" option?no u dont so go to edit- delete all by type- history

just try it and save the scene and check the size of it!it has to be MUCH smaller now!

i dont know a Optimize scene size option ...can someone else explain us??i think its nothing important ....