What is the best approach for rendering static & dynamic content?

[juliuslipp]

I have the following (quite common) szenario, on our page, we have a blog, docs and marketing pages, which can all be prerendered, because they don't change. Our header on the other side always renders (similar to github) the user-icon on the left top side, if the user is logged-in. If I prerender the page, the layout (which I marked as prerender=false and contains the site-header) server function doesn't run anymore, hence I can't render the user. I could just fetch the user client-side, but was hoping there is an option to render a single component on the server at all times, while the rest could be static.