There are actual microprocessors running down there inside your computer,..
Running efficient code written in C, honed and optimized for 40 years. The file system and graphics don’t happen by magic.
You are sitting on top of a giant towering pillar, and at the top of that is a fat fluffy in-efficient cloud called Java script. You’re gleefully rolling around in that cloud like a child, saying ‘Wouldn’t it be great if everything was made from candy floss and fairy dust’