OK - I will try to explain again.
CPU = Central Processing Unit - the main brain of your computer.
There is a way find out on what fraction of the "brain" power of the computer (CPU) is being used by any particular program.
This is done by pressing CTRL-ALT-DELETE on the keyboard - which brings up the Task Manager;
From there you click on the Processes tab, and you will see that the Process for Flip Words (Flip words.exe) is always using 45-50% of the CPU.
That is a lot for such a simple game.
Maybe there is a different forum I should post to with technical questions?