There is this concept of "flow"- a break in your concentration (for example, because your IDE is too slow to keep up with your typing) can often be enough to pu

There is this concept of "flow"- a break in your concentration (for example, because your IDE is too slow to keep up with your typing) can often be enough to push you out of this state of flow. Sure, if I know my compile is going to take a few minutes I can plan for it, and work on other stuff in the mean time. But for me the tiny interruptions really add up, and contribute to me not being as productive as possible. This is especially true when you're hunting a bug, or working in a tight TDD loop where you're constantly editing/compiling/testing. Having to wait for the machine is a real morale-killer.