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I wonder if "that of" used in the following question doesn't create grammatical error. If it does, then I also wonder the corrected form or alternatives.
The statement:
The running time devided by a factor reflects the performance of the CPU used here compared to that of used in the previous research.
The sentence is ungrammatical, uses the word factor incorrectly and mispells the word "divided." It should read:
The running time is divided by a constant to make the performance of the CPU comparable to that of the CPU used in the previous research.
