Since one of my scripts got incredibly complex, i was benchmarking the performance of moving some javascript processing logic to the server side in my ASP.NET MVC 4 application. According to taskmgr.exe, IIS Express only utilizes 13% of my i7. I decided to throw in 3 parallel tasks calculating the fibonacci sequence up to 50 and the IIS express still wouldn't utilize more than 13% of my cpu. Is there anything i can do, so that the application utilizes the full cpu, as it would in a real server ? Are you asking about load testing? I don't usually write an application with the intention of getting it to use 100% CPU. -- HackedByChinese 2 days ago @HackedByChinese I'm asking about how to allow IIS express to use more than 13% of my CPU. -- John Nevermore 2 days ago 3 I doubt that it's a coincidence that 13% is basically one full thread of a quad-core hyperthreaded core i7. I agree with dtech though - I think server fault is a better fit here. -- Jon Skeet 2 days ago 1 @rekire: But the OP's entirely reasonable (IMO) point is that if IIS Express is only going to use 1/8th of his processing power, the chances of scaling are significantly reduced... -- Jon Skeet 2 days ago Questions on Stack Overflow are expected to relate to programming or software development within the scope defined in the FAQ . Consider editing the question or leaving comments for improvement if you