dsf.vim VS FastFold

There is a plugin that does this: dsf.vim.

I use dsf.vim which is a Vim plugin, so I'm really curious to hear if there's one that uses treesitter

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

If you don't get great results, try changing 'foldmethod' (syntax is usually best but indent often works well). If vim doesn't have syntax support for your language, find a plugin that offers it. Even better if it defines 'foldtext' so your methods collapse down into an easy to read outline. I use vim-ficklefold to manage folds and FastFold to prevent syntax folds from making vim slow.

FastFold

Could be foldmethod=syntax that's slow, try FastFold.

FastFold, fauxClip, syntaxMarkerFold

I have have the same problem. I found this plugin FastFold that seems to be what we are looking for but I haven't had the chance to test it yet. The general idea is to stop autofolding under most circumstances except when it makes sense.

Check out FastFold plugin

Because in this case the way this plugin works causes folds to recomputed. Fold methods syntax and expr are slow, cause those are written in Vim script instead directly in C. Plugin FastFold lets you change this behaviour and update folds only on demand.

Some of those rules can be quite heavy on large files, so FastFold really helps here. It also prevents uncontrolled folds opening when editing, so just added bonus. Another plus are temporary manual folds.