I use LanguageTool extension for both english and french with huge locally n-grams data (over 17.5GB) so the extension is expected to always slow down Writer while parsing the content of opened files. That’s why I want to disable it temporarily to have more speed for files that don’t need text verification.
And I don’t have always internet, and even If I have it the fact to always download each time over 200MB to use LanguageTool extension is something fastidious.