> Less traffic in data-rich apps (even taking into account compression, HTML is heavier than JSON and not just due to syntax overhead - consider all those page

> Less traffic in data-rich apps (even taking into account compression, HTML is heavier than JSON and not just due to syntax overhead - consider all those page headers, footers and other common parts) > Better UX for slow networks: even in countries with 5G coverage there are still a lot of corners where your device will struggle to connect. SPA can auto-retry, just showing the spinning wheel longer. Browser will show the timeout page, and who knows if the backend can correctly recover on refresh. It's more often the converse in my experience. If you have a slow or flaky connection, making many API requests to get all the data your SPA needs to fulfill an interaction yields worse UX than just asking a server to process it all and give back a final result for the interaction. The round trips are the killer there.