Willie Mosconi was known as a fast player for his time. His movements certainly weren't fast, I prefer to think of him as an efficient player. He didn't have a lot of wasted motion or pauses. When you decide your pattern at the start of an inning and you stay inline, why would you want to think before shooting? Stay with the plan and execute.
Your entire inning at the table should seem to be one continuous motion. It can't be if you are overthinking every shot. Usually all you get out of thinking between shots is misses. If not the ball, the pattern. When you break the pattern then you have to decide how to get back on the original pattern or you have to develop a new one. Once again, plan your entire pattern, then execute.
Except for straight pool with all the breaks involved, a run in pool shouldn't require thought during the run.
Hu