[kitd]

Server-side rendering + Turbolinks [1] + jQuery-or-equivalent gives you an SPA experience anyway, without the client-side bloat. With judicious use of markup, it can be massively more responsive.

[1] - https://github.com/turbolinks/turbolinks

[ksec]

There is also Stimulus Reflex [1] which is like a Turbo Charged Turbolinks. The idea is from Elixir / Phoenix 's LiveView.

I think Laravel has something similar as well. These are the three big groups that are actively frighting the SPA trend.

[1] https://github.com/hopsoft/stimulus_reflex

[ComputerGuru]

See also unpoly and intercooler, which are more powerful and intended for more fine-grained usage.

https://unpoly.com/

https://intercoolerjs.org/