Yay, no more issue in YARPP! Thanks!
However, I still have this long posting issue. I already have a posting time about ~10s without your plugin, but when it's activated I have seen as much as 26s (recorded with the Google Chrome inspector)!
Again, I don't blame your plugin for that, I have a really cheap web hosting (that is widely sufficient for my needs though), it just would be great to have the "Posting comment" message box on screen (no timeout) until another message (confirmation or error) appears. That could be done easily by replacing the line 22 in wp-ajaxify-comments.js with:
timeout: (type == "loading") ? 0 : 3000,0
I applied this with success on my blog, but I have to do this modification on each update unless you integrate this directly out of the box :)