Is the application designed correctly on node.js + jade + react?

Question

Node.js

Greetings.
I plan to develop an application consisting of:
- templates that will be written in jade,
- components that will interact with different APIs via AJAX - on react (they will be embedded into the page after rendering the main part of the page, so that part of the content is given to the user immediately)
- node.js + express server script that runs it all.
Question:
1. You need to render jade templates "on the fly" at the request of the client, i.e.:

app..set('viewEngine', 'jade');	
    app.get('/',function (req, res) {
    res.render('pages/landing', {locals:{'text':'demo'}} );

  });

Or is it better to collect them with gulp in html, and give ready-made html with express?
2. Does it affect performance when there is a lot of traffic?
3. If I have an authorization that is stored in the session, I can use it when rendering the template, i.e. so that for example in the header I was shown "you entered as Vasya"? (similar to php, only on server js)
ps This is my first application on node.js. Thanks to everyone who will respond.

Answer 1

Why is jade here if React can render on the server as well ( React.renderToString and React.renderToStaticMarkup )?

Answer 2

consider giving the static to nginx, and let node give json only, authorization will be needed - screw it on the token.