Compare your #webapps and see how much memory and CPU they are using.
Oh wonder #SPAs are more prone to memory eating, by nature, there is more dynamic page content, more #JS. Already the base memory footprint is double that one of an MPA.
Just check out the your browser's task manager. #devtools
And in doubt #usetheplatform, or in other words: HTML and CSS are powerful tools and solve more problems than some may think. Try to think simple(r).