Each reply within a post occupies a lot of space so you end up with a very long page. With just 10 single sentence replies it feels bloated. I have no idea if that can be fixed or not, but an observation.
Maybe in the same line of thought - the forum does not adjust width beyond a certain point. If the forum would dynamically adjust to the browser’s width it may help debloat the replies’ size. Maybe something that could be changed in the CSS?