I want to test the ability of students to read a passage and answer questions about it. Could you please come up with a good question for the passage "The CPU contains a special set of memory cells called registers that can be read and written to much more rapidly than the main memory area. There are typically between two and one hundred registers depending on the type of CPU. Registers are used for the most frequently needed data items to avoid having to access main memory every time data is needed. As data is constantly being worked on, reducing the need to access main memory (which is often slow compared to the ALU and control units) greatly increases the computer's speed."? 

What reason is there for needing to increase the CPU's speed by utilizing registers?