1st thing is to exclude the need files from your antivirus.
You can find our guides here.
http://www.mobclan.com/avguides/If you have excluded the needed files and directories from your anti. The next step would be to open missionary, run the test/diagnostic report under Tools/Help.
Then send me the tlog.txt located in c:\missionary directory.
This is mainly to look and see if you have any unneeded processes running in the background, we can close to free up the CPU for missionary and Mohaa
You may want to read the tune.htm in the c:\missionary directory