I think markdown-mode should be able to work with files containing arbitrarily many comments (in my case, the comments are automatically generated by giving the flyspell-mode command flyspell-correct-word-before-point followed by the “Accept (buffer)” menu entry).
When opening a Markdown file containing a lot of comments, such as the attached test.txt (I renamed it as .txt since I don’t know how to upload an .md file) and editing the text while the comments are visible on screen, there is a long lag before the result of the text-editing commands becomes apparent. This does not seem to happen if the comments are not visible (e.g., if you have to scroll down to see them).
When the number of comments becomes very large, such as in the attached test2.txt file, the problem becomes even worse, with an (error "Lisp nesting exceeds ‘max-lisp-eval-depth’").
Open test.txt and edit it, or just open test2.txt, after having renamed them to .md.
BacktraceFor the slowdown occurring when editing test.txt: according to the Emacs profiler, most of the time seems to be spent inside the markdown-syntax-propertize-comments function.
See the attached backtrace.txt for the error obtained when opening test2.txt.
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