What do you mean by “restart LT server” ?
I’m using this plugin GitHub - rhysd/vim-grammarous: A powerful grammar checker for Vim using LanguageTool.. Every time when I want to do a check. I use :GrammarCheck in vim.
I believe this plugin is calling languagetool-commandline.jar. Does that mean a restart ? If so, it won’t bother me, even it’s the easy way 