For anything lsp related, this fork by the lsp authors has been noticeably snappier and more pleasant to use for me (large rust project): https://old.reddit.com

For anything lsp related, this fork by the lsp authors has been noticeably snappier and more pleasant to use for me (large rust project): https://old.reddit.com/r/emacs/comments/ymrkyn/async_nonblocking_jsonrpc_or_lsp_performance https://old.reddit.com/r/emacs/comments/ymrkyn/async_nonbloc... It moves the json rpc stuff to be async, and makes a real difference in terms of perceived performance.