> The question is how well you can react to a user action if you need a network round trip in the middle I do think this is the question, but the solution is n

> The question is how well you can react to a user action if you need a network round trip in the middle I do think this is the question, but the solution is not an SPA, but instant interaction feedback and no content jumping around. If you solve that, a 1-2s response from the server will seem instant, whereas with a bad implementation, you can have everything on the client-side and make that 0ms interaction look more sluggish than the one that goes to the server. Think of a chat application, if you send a message and press send, it doesn't matter the request takes two seconds, if: * The message is immediately shown in the chatbox * There is direct feedback on the status of the message (sent/received/read) * You can continue interacting with the application while the message is being sent (non-blocking) You don't have to send all the data/messages before (server-rendered), just some logic to what happens when an action is taken.