Someone also adviced here long ago (Was that Jiimbuna?) some hardware/software changes that will help your PC -new or not- loading faster:
SOFTWARE:
1.- Do a defragmentation if you haven't done one long ago
2.- If you have two HDDs, then use one (the smaller if they are different) to have Windows and general programs (DVD player, Office, etc.), then the second one for games and data.
3.- For single missions, enable one of the mods that empties your career files. Otherwise they are also loaded with the single mission, and that is nearly dramatic.
4.- For campaign missions, see if your career allows using a reduced campaign file (Black Sea, Indian Ocean)
5.- Additional units like community ships mod or IABL ships for NYGM add loading time
6.- Use lite harbour traffic whenever possible
HARDWARE:
Cheapest:
1.- Get SATA2 disks. They are WAAAY faster than the old IDE ones
2.- Get a second hard disk if you don't have one
3.- Get additional memory modules
Most expensive:
- PC upgrade!
I also had an idea some time ago that would help a lot, but I would need to consult that with BBW first. It probably would involve creating an auxiliary external program to help with the necessary cut in the campaign layers, but it could well be worth it