Pict
Nebula 3 pro server
Does the software come with any support?
Have you contacted Acustica Audio to see if they can make any suggestions?
Have they tested their product with Sonar X3 (or even an older version of Sonar)?
Are other people reporting this problem with them - do they even know a problem exists?
Does Nebula have settings to tweak? If so, don't assume the same settings work between all DAWs.
Surely they want their software to work efficiently in any DAW or they risk losing customers.
If every VST was performing badly in Sonar then it might be fair to point a finger at Cakewalk. But this appears to be more of an isolated problem - maybe Nebula needs a tweak, not Sonar. (Didn't Waves just release an update late last year related to Sonar compatibility?)
Just sayin ...