Hi,
I use LanguageTool in a few configurations, one of them is Thunderbird (102.15) with self-hosted LT server (other also with Premium LT). Recently, I’ve come into a very annoying problem when participants in the conversation use very long signature (circa 4k chars…). After 1-2 emails, when I want to reply, the LT extension starts freezing the Thunderbird. The application is after a few or many more seconds functional again, but every new char brings the problem once more. The email format is text only.
I did a few tests to better understand the problem:
- I see that LT extensions is sending a lot of “\n\n\n\n\n\n\n\n\n\n\n\n\n” to the server right after my message - I assume it’s leftover from removing the citations of previous emails;
- switching to a premium account brought no changes;
- the problem doesn’t exist in the web browser - either with self-served or with Premium server, the spellcheck results are eventually delayed, but the window isn’t frozen;
- I successfully reproduced the problem by sending long messages to myself (although it was still shorter freeze, but I probably didn’t use enough long text);
- disabling LT checks solves the problem (but I lose the LT hints as well ;)).
Looking into Developer Tools and trying to debug the extension brought me an impression, that the freeze is before the extension sends a request to the server (although I may be wrong).
I would appreciate it if you were able to fix this, as the LT is really helping me with writing emails 
I’d suggest that maybe the code for removing the previous emails from checked message isn’t working very well with a long text (but perhaps the processing could be eventually stopped after processing X lines of quoting?). Actually, I’d also think about some kind of delay/rate limiting on sending text to the server instead of doing after every char (or maybe it already is, but I just missed it looking for a source of my problem?)
