No major problem here. I use slightly older computer, so with forum configured for 300 posts per page, longer threads are not exactly quick to load. Even worse if there are lots of images. Probably the most extreme example is this thread. But once it loads (and that works reliably), it’s fine. New documentation (help.mikrotik.com) is a bit on modern overscripted side, but it’s usable (at least speed wise, but I can’t seem to find anything there without using search; I never had such problem with good old wiki.mikrotik.com).