Also, because of how complicated modern pipelining is, some instructions that you wouldn't expect to take a long time do take a long time (usually because they'

Also, because of how complicated modern pipelining is, some instructions that you wouldn't expect to take a long time do take a long time (usually because they're waiting on a mov from memory to finish). In this case, the mov from memory could be throwing up a hazard that's blocking the mov from register.