Interesting. I thought it might have been my end, but look like I am not the only one experiencing this slowness on desktop Firefox browser. I just visited the forum today, and it was loading rather slow on my Firefox browser. The reaction choice pop-up was also slow as well.
My last visit was last week for the Tinto Talk threads and, IIRC, it was loading fine. Had there been any changes to the forum code, server, or something since then?
Possibly unrelated, but the forum was also rather slow in reacting to my typing on Firefox on my iPad as well, though it was more normal in receiving keyboard input on the desktop; could have been my iPad, though.