You don't really do these any more on a modern CPU. This is stuff I used to do 30 years ago and you might still do if you're on a micro-controller or some other

You don't really do these any more on a modern CPU. This is stuff I used to do 30 years ago and you might still do if you're on a micro-controller or some other tiny system. The CPUs aren't slow. Tne main problem is if the OS doesn't schedule your process it doesn't matter how fast the CPU is.