First. I open a note and have to wait up to a minute to load spellcheck indicators, red highlight. If I scroll the note, everything aggravates: a have to wait even more, and spellcheker find only 1 or 2 mistakes. If I copy that bottom text to a new note - it immediately highlight all mistakes. Scrolling ruins spell check
It brakes after ~1200 words
Second. The default dictionary for Russian is terrible. It marks as mistakes names and common obscene words like “дерьмо” (shit) and slang, and evencommon words like “обувница” (shoe cabinet)
Obsidian user with multiple language checkers active here.
I have found similar performance issues on my Windows install (I tried haphazardly scrolling up and down as a way to get the checker to get what I want) but not on my Linux install.
You can try installing another OS. There’s tons of tutorials on this on the net/YouTube.
I can’t say anything about the Russian dictionary being small other than that it is not an Obsidian issue as I seem to remember Obsidian uses an external electron spell checher (equivalent to what you’d get in Chrome). – I tried to check on the forum for this but I can’t find it now.
I agree the first problem needs addressing on multiple fronts (by you and for other users, generally).
On mac it worked also particularly and temporary… And after - long work or PC after sleep - spellcheck tottaly stops to work. One has to close and re-open all windows to start the spellchecker.