• First “myth” is wrong. Loading CSS and JS with every click isn’t about being “slow” it’s about being efficient. CSS and JS requests add a non-trivial load to the server. So if you have 10,000 clients making requests for content they already have cached (they’re just checking to see if these assets changed) then you’re wasting server resources when you could’ve just kept the single page active and requested just what you needed over an AJAX call or even better: A WebSocket.