I am unable to see any difference in the performance of the json parsing in emacs -q and in my setup - it is still ~2 times slower. I believe that it is caused by code_convert_string . I compiled emacs without that call and there is no difference in performance in both setups and the parsing is 2 times faster than emacs -q with code_convert_string.

I want to discuss the native json performance in the context of lsp-mode needs. Is it ok to do it in this thread?

Thanks,

Ivan