Creo file size with zero features is 3052kb. Any idea why is it so?

Do you have any appearances with image maps?

It must be an old file that has had stuff deleted from it, yes? I just created a new file (Creo 4.0, M090) with no template (empty) and its size is 34Kb. I think there's a lot of "baggage" and other remnants of stuff left in a file even after all the features have been deleted. I don't know what kind of persistent junk is retained in the part database, but I wish there were a way to purge it.

Are there a ton of parameters and relations that calculate values?