How would you design a system to offload CPU-intensive work from the main thread using Web Workers, and what are the serialization and communication trade-offs?

Imagine you're drawing a picture and your mom asks you to carry a heavy box. You can't draw while carrying the box. Web Workers are like a helper who carries the box for you, so you can keep drawing. But you have to write notes to tell the helper what to do, and that takes a little time.