Hmmm, what a pain. Darwinia used to have a juddering issue with dual-core processors, though it didn't seem to apply universally - I never experienced it myself. Do you have a dual core system? If that's the issue, then forcing it to use only one processor will help.
Try backing up the .exe file, writing the following in Notepad:
Code: Select all
imagecfg -u multiwinia.exe
imagecfg -a 0x1 multiwinia.exe
pause
Saving the file with a *.bat extension in the Multiwinia directory, and executing the file.
EDIT: There may be a 'set affinity' option in Task manager, which is an easier one-off way to test if that solves the problem.