After clicking the button to jump to last viewed post on the meltdown thread on premium, I was stuck on that page. There was no arrow to go the next page, and the page count at the bottom read 779 of 0.

If I jump to a page number directly either by manually putting in the url with the page number or by using the page number selection on desktop, the same issue occurs. When going backwards starting at the last page, the issue starts with page 790. Pages in the beginning of the thread aren't affected. I don't know what the first page affected is but it looks like all of them between 779-790 are.

This is happening on both mobile (Galaxy S5) and desktop (iPad Air2) sites.

Can confirm that this was happening for me tonight as well. iPhone 6 Plus running 8.4 and using Safari.

Overall use on the site has been extremely slow in the last few days. I know traffic is up with practice, but every page is taking 3-4 seconds to load. Drop down watch list is taking 4-5 seconds to populate. Going to last read post is taking 3-5 seconds as well. This happens on wifi and with 4-5 bars on LTE during varying times of the day.