What can i do to decrease the load time between maps?

What speed does your ram run at? Also, what kind of storage are you using? Slow HDD or? If you're computer savy with older hardware, you might want to get an identical HDD to the one you have now and run at raid0. If you've got the funds to burn, two SSD on a raid0 will be superior in every way. Overclocking your ram could give you small gains, but nothing you're going to notice with the naked eye. Your best bet is SSD or raid SSD for loading times.