The ServerSideRender component is really handy, especially as a gateway for developers to get into building blocks however the constant reloading causes a lot of page resizing and a bit of a clunky experience.

David Gwyer has made a drop in replacement that is a lot nicer and I think it should be merged into core.

You can see the replacement here: https://github.com/dgwyer/server-side-render-x

And here's a gif showing it working:

The code moves the spinner and only replaces the content once it's loaded making the experience feel less clunky.