Out of curiosity, I just tested a 100-comment thread on my phone with Firefox. Folding it was instantaneous, unfolding it took ~4 seconds. That makes me wonder

Out of curiosity, I just tested a 100-comment thread on my phone with Firefox. Folding it was instantaneous, unfolding it took ~4 seconds. That makes me wonder what takes so long, given that the initial page load didn't take anywhere near that long.