I agree with Britt Malka that " ... Linux is a lot faster..."
Attached is a jpg showing how an old Pentium II computer coped very well under heavy load of more than 5 hits per second for over 3 hours. This was while testing moodle on the new DSL 1.0.1
DSL is less than 50MB to download. The server CPU load was over 90% most of the time but the memory use rarely exceeded 75% and the swap file use was 0%