If that's all you're doing when browsing the forum, then no, I guess not. The forum has a documented issue with retrieving old posts though. I've been struck by this in the past when trying to dig up old threads.
<https://github.com/nim-lang/nimforum/issues/287> My main gripe with NimForum is that it lacks many features that basic web forums offer. I guess I'm also in the minority in that I don't care about Nim for its web development offerings. I'd rather use other languages for web application development. When I think about the NimForum, I also inevitably end up thinking about how much time went into developing and maintaining the solution and to what end. I've always advocated the community should ditch them and migrate to discourse / phpbb / whatever.