There are multiple other threads on this issue; look around the forums. People who keep telling people to upgrade need to shut up, because users with entirely new PCs, using SSDs, are getting 8-10s load times, EVEN IF YOU ARE NOT.
YOUR LACK OF PROBLEM does not mean SOMEONE ELSE DOES NOT HAVE THE PROBLEM.
Autosave seems to be one culprit, but honestly, with the super-fast PCs we have today, loading a 5MB file should not be causing these issues. Load times when starting the game - and reading the save game directory - are also way out of proportion. My time until 'continue' was available has gone way up, and I have less than 30 save game files!