OutTel corporation has been delivering j786 microprocessors to the computer industry for some time, and Metoo systems has decided to get into the act by building a microprocessor called the “clone7861”, which differs from the j786 by providing twice as many processor registers. Metoo has simulated many programs and concluded that this one change reduces the number of loads and stores to memory by an average of 30%, and thus should improve performance, assuming of course that all programs—including its popular microkernel operating system—are recompiled to take advantage of the extra registers. Why might Metoo find the performance improvement to be less than their simulations predict? If there is more than one reason, which one is likely to reduce performance the most?