[jasonlhy]

Server side rendering is not really that slow, and SPA is not really that fast if your bundle size is huge.

More important is that most users will not able to distinguish the difference. I have asked my friends how they feel to compare Facebook to a traditional MVC web site in term of speed difference, none of them can feel the difference.

However, the transition from page to page do affect the user experience. As a user, when I want to do a task that involve many UIs and I need to click multiple pages, I will think it is a bad experience, but I do accept to switch to another page for another task. Therefore, It makes sense to have a SPA for some rich UI feature so that user can remain in the same page