Good, but slow

It’s been a godsend for importing large Word documents into WordPress while keeping the formatting (indented paragraphs, to be specific). I’m deducting a star though because it is verrrrry slow and has a tendency to crash the (or at least my) browser if used too many times in quick succession with restarting. (Oddly, when importing even older text files that I had pasted into Word, it also didn’t recognise a series of spaces as an indentation (when, only the tab key, but that could be a Word or WordPress limitation for all I know, so I’m just noting it down in case it is a limitation and the devs wish to update it.) Hello. Could you tell about crashing with more details?