It's been around for a while now and I still don't get it. I tried Waterfox on the premise it was faster than Firefox because it was 64-bit. I didn't notice a difference. What is a 64-bit CPU What is a 64-bit operating system What is a 64-bit program Do you need all of the above to make a difference? For example would having a 64-bit CPU and 64-bit operating system make 32-bit programs run faster?