> And this is why half of the internet is borderline unusable. Page layout jumping around for 5-10 seconds after what appears to be a full page load
This is not why half the internet is borderline unusable. React will happily do a full page render in under a second (including network load time). The primary reasons for that are:
1. People writing code that does many network requests in series. 5-10 seems to be not uncommon for many apps.
2. Adverts and as SDKs.
The app I inherited at my last job was a huge 2MB bundle (due to including both the firebase SDK and a large charting library), which I assumed was the cause of the slowness (it was taking ~3-4 seconds to load). But it turned out that was serial network requests that were slowing it down. The app is still 2MB (we made good progress on removing firebase, but hadn't quite gotten there when I left) but it now loads in around a second.
This is not why half the internet is borderline unusable. React will happily do a full page render in under a second (including network load time). The primary reasons for that are:
1. People writing code that does many network requests in series. 5-10 seems to be not uncommon for many apps.
2. Adverts and as SDKs.
The app I inherited at my last job was a huge 2MB bundle (due to including both the firebase SDK and a large charting library), which I assumed was the cause of the slowness (it was taking ~3-4 seconds to load). But it turned out that was serial network requests that were slowing it down. The app is still 2MB (we made good progress on removing firebase, but hadn't quite gotten there when I left) but it now loads in around a second.