Perceived performance (showing something) is more important to users than the ultimate load time. So prioritizing your assets so the critical stuff loads first

Perceived performance (showing something) is more important to users than the ultimate load time. So prioritizing your assets so the critical stuff loads first is a good strategy. Keep in mind that JavaScript blocks rendering, so you want to make sure that you're still delivering the CSS and primary HTML content first. I don't want to wait for your massive JavaScript library to load and execute before I can read the text on the page.