"Blank page" problem is usually only a problem if your site is really slow, but if it is fast (because of server side rendering) it is less of a problem.

As the presenter in the video said, browsers can render HTML documents really fast, this leads to some interesting conclusions.

Assume that you need to render a modal as popup for each item in a grid.

Frontend solution would be to reuse the same modal for every item and just swap in the on-the-fly rendered content for that item. Or maybe even on-the-fly create & render the entire modal when needed.

Backend solution would be to render one modal per item. This is actually easier, just loop & have unique ids (you can even reuse the same loop that you build the grid with) & no need for dynamic loading, rendering, etc. So even if you send more HTML down the line, the page acts smother.