JSON parsing bottleneck

[geza-herman]

This is not strictly an lsp-mode question, but related.

I read at reddit that in some cases, JSON parsing is the bottleneck in lsp-mode, causing 1-2 second freezes.

I'm working on a faster JSON parser (replacing the jansson based parser in Emacs), and I'd like to try it out how it performs. In theory, it is works well: using clangd LSP messages as a dataset, my parser runs 8-10x faster. But this is just theory, I'd like to try it out in real circumstances. Does anyone have a simply reproducible case where JSON parsing is the bottleneck and it causes the mentioned freezes?

(if anyone wants to try out the new parser, it is attached as a patch to this email: https://lists.gnu.org/archive/html/emacs-devel/2024-03/msg00597.html)