I'm not a fan of web frameworks such as React and CSS in JS, but to be fair, you should not stare blindly on first-time-load times! Imagine if you would include

I'm not a fan of web frameworks such as React and CSS in JS, but to be fair, you should not stare blindly on first-time-load times! Imagine if you would include download and install time when you measured native app performance... You should also take into account repeat use performance! While most "users" will just load the app once and leave, those who actually use the app will spend hours clicking around and doing stuff, and that's where aka "single page app" have an advantage over full reloads. Measure things like click latency and re-render times!