Is there any overhead incurred by I/O Express at the instruction level?

Yes, naturally there is going to be some overhead. Even if a program has a single MACRO instruction, there is a little bit of overhead involved. However, the performance boost incurred with I/O Express makes the little bit of overhead pretty much negligible. For example, if the overhead involved in running I/O Express is 1 second and the performance increase is 15 seconds, you have gained 14 seconds. Therefore, there is no loss.

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