I've never really understood the purpose of the
turbo button.
If it makes your computer faster, why not have it on all the time?
If it doesn't make it faster, then what's the point?
However, after exhaustive research, I have discovered its true meaning.
Back in the old days when processor speeds would double at insane rates, software wouldn't pay any attention to the speed of the processor. If you had that fancy new Pentium 133 and you tried to run a game written a few years ago for a 286 it would run much too fast.
So, you turn the turbo off. Voila, instant slowdown.
These days, software is smarter (or claims to be), and if you even have a turbo button on your computer casing, it probably isn't hooked up to anything.