CPU Doubler requires system 7.0 or higher and uses very little RAM and hard disk space. It will yield the same performance boost on either a 68K or Power PC Macintosh. CPU Doubler achieves its performance enhancement by properly managing the computer's throughput. Throughput is defined by the amount of time the processor spends executing process instructions. A process is any piece of software that performs some function on your computer, independent of the system.
All applications run as processes.
Some system extension, such as file sharing, also run as processes, albeit hidden ones that the user never sees. There are two ways a processor can waste time. It can waste time sitting idle, or it can spend too much time swapping processes in and out. By sitting idle the processor wastes valuable cycles that are not used to execute your application code. If too much time is spent swapping processes in and out, then the overhead associated with the swapping causes the processor to spend valuable cycles setting up registers and memory for each process that is swapped in as well as cleaning up registers and memory for each process that is swapped out.