Browsers are ridiculously fast. People just add more and more until they hit the wall where they need to start optimizing. For someone trying to get things done

Browsers are ridiculously fast. People just add more and more until they hit the wall where they need to start optimizing. For someone trying to get things done, that’s probably the right method. But it means that ultimately what determines how fast your program runs is not how fast your computer runs, but how much delay you’re okay with.