Just be aware that the marker based folding can be annoying to collaborators if you are working on documents with other authors. With a plugin like FastFold [0]

Just be aware that the marker based folding can be annoying to collaborators if you are working on documents with other authors. With a plugin like FastFold [0] you should be able to have fast folding with the expr foldtype. [0]: https://github.com/Konfekt/FastFold https://github.com/Konfekt/FastFold