Click "Read More" below for annectdotal CPU experiences.

Claification for would-be flamers:
The most CPU-intensive sections of xMule have been totally re-implemented and use now roughly 1/200th of the CPU cycles they once required. So if you are downloading 5 files with more than 400 sources each, your total CPU cycles used by xMule will be roughly 10 times less in 1.9.4 than 1.9.3 over a period of 24 hours.