I don't know if it's related to the "mobile only" Event History fix, but the pages are opening way faster today on PC than they have since they slowed them down years ago.
(For those who weren't here then, initially all the pages in Event History were basically downloaded when you first opened it, which did mean that there was a short wait for it to open. However, as soon as you clicked for the next page it immediately opened. Then they made it so that when you first opened Event History only the first page loaded. Made the initial page opening much faster, but that added a delay whenever you went to another page because it had to load. Theoretically this meant that anything that happened while you were viewing Event History would be added in real time. The reason they gave at the time for that change was to speed up the initial opening. That was more than offset, however, for those of us who use Event History extensively because the added delay to each page opening was much more aggravating than the short delay at the start.)