NSW can be a resource hog if you run all the programs it wants to at startup + whatever you already had in startup before installing NSW2001. A little more info regarding your computer system, i.e. how much memory, system resources at startup, number of programs running in background, etc. You can disable a lot of the NSW2001 programs and still be effective (NOT the Anti Virus). Also, the more sensors you have running in System Doctor can drag down your operation.
I run NSW2001 Std. & Pro on three computers and laptop, and have found it to be a valuable utility, but it does take some adjustment to settings to keep it from using too many resources.
Wino