Comment by alexpetros

In many cases, browsers will also automatically perform a "smooth" transition between pages if your caching settings are don well, as described above. It's called paint holding. [0]

One of the driving ideas behind Triptych is that, while HTML is insufficient in a couple key ways, it's a way better foundation for your website than JavaScript, and it gets better without any effort from you all the time. In the long run, that really matters. [1]

[0] https://developer.chrome.com/blog/paint-holding [1] https://unplannedobsolescence.com/blog/hard-page-load/