You're right that it is often the most important thing - but not always. For example, people (myself included) often have a YouTube video playing in the backgro

You're right that it is often the most important thing - but not always. For example, people (myself included) often have a YouTube video playing in the background, which also consumes a lot of resources. Having both may start to cause problems. Regardless it is a good thing to avoid over-computing. It helps those with lower powered computers or people on battery-powered machines.