If you memorize it you don't have to context switch when you look it up. The benefits of memorization are enormous if it reduces your the number of times you ha

If you memorize it you don't have to context switch when you look it up. The benefits of memorization are enormous if it reduces your the number of times you have look up details to zero. It's similar to touch typing vs hunt and peck typing with the following exceptions: 1. context switches are much more expensive than looking at a keyboard to find the key to press, 2. memorization enables you have a more complete mental model which greatly speeds up design, reduces bugs and enables you to find bugs faster. 3. you gain surprising insights if you can run the program in your head when you are falling asleep, in the shower or walking around. When I am doing cryptanalysis the first thing I do is commit the protocol to memory. Sadly if I'm not working on it 24-7 I quickly forget and have to rememorize.