On 18.08.2022 11:44, Yuan Fu wrote: > > Good news, the slowness can be easily resolved by compiling the query pattern in csharp-mode-font-lock-settings-1 (this is a recent addition to treesit). > > Yuan Thanks for the reply and thanks for looking into this. I can confirm that by compiling the query like you suggested, and replacing linum-mode with nlinum-mode, I'm not experiencing any performance issues any more! To avoid issues like this... Should perhaps the function treesit-query-capture (in treesit.c) emit a warning/message when encountering non-compiled queries? That way writing more performant major-modes would be more self-explanatory, resulting in a better, faster Emacs for everyone. -- Vennlig hilsen *Jostein Kjønigsen* jostein@kjonigsen.net 🍵 jostein@gmail.com https://jostein.kjønigsen.no