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I'm working on a program that processes many requests, none of them reaching more than 50% of CPU ( currently I'm working on a dual core ). So I created a thread for each request, the whole process is faster. Processing 9 requests, a single thread lasts 02min08s, while with 3 threads working simultaneously the time decreased to 01min37s, but it keeps not using 100% CPU, only around 50%. How could I allow my program to use full processors capability? EDIT The application isn't IO or Memory bounded, they're at reasonable levels all the time. I think it has something to do with the 'dual core' thing. There is a locked method invocation that every request uses, but it is really fast, I don't think this is the problem. The more cpu-costly part of my code is the call of a dll via COM (the same external method is called from all threads). This dll is also no Memory or IO-bounded, it is an AI recognition component, I'm doing an OCR recognition of paychecks, a paycheck for request. EDIT2 It is very probable that the STA COM Method is my problem, I contacted the component owners in order to solve this problem.

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