The last years I had issues with application servers using large amount of CPU and even hanging application servers running the Tiny Spellchecking service. It ended with disabled spellchecking in the Tiny editors config.js.
Now after updating to the actual editor version TinyMCE 5.10.2 we decided to reenable the spellchecker and the first days it looked like, that the issue was really fixed. Sadly after about a week the first application server started to use 800% CPU just for the server hosting the spelling service.
This is a companion discussion topic for the original entry at https://stoeps.de/posts/2022/change-spellchecking-to-hunspell-in-tinymce/