How to create an isomorphic application using .NET CORE 3.1 and React?

Question

.NET

Hello!
Using .NET CORE 3.1 and React I plan to create a web application.
There are 3 main approaches
1) Classic
2) SPA
3) Isomorphic (universal)
In relation to the classical approach, SPA applications do not work so fast,
but I just need performance, and at the same time flexibility on the client side. Tell me, does anyone have experience using these technologies, what templates should be used in VS2019, how to create an isomorphic application in my case?

Answer 1

Where is productivity?
What I see in the description is to render all the code on the server and give it to the client, and then hang JS on top so that it adds interactivity.
It’s clear that the server will sit down, but the plus is that ready-made HTML is already being given, which is understandable even to a bot (SEO approves).
After the return, everything turns on the client and new pieces of code are sent via ajax, which has a positive effect on network traffic, but loads the client.