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I have a question about the speed of PCG and PCGN calculations. I am using an x64 bit computer having 16 cores. In my case, if I run a PEST calculation using PCGN solver then it takes about 100% of the CPU. If I run the same model using PCG solver it only takes about 5% of the CPU. However, the time it takes for PEST to complete the first 5 iterations using PCG is less than once it uses PCGN. I was expecting PCGN to be faster than PCG. Am I missing something here? 

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