My site is having a performance problem but just on checkout. It varies but sometimes can take up to 2 minutes or more after clicking checkout to complete the process.. It's irrelevant which payment/shipping method is chosen.

Using v1.3.8 on a Windows server. Any suggestions?

And please.. kobra.. don't respond by saying "You cart should not be slow, something is wrong." because those types of responses help noone :)

Thanks everyone!