Something happened when the site admin/mods had to rebuild the site more or less from scratch using a database backup a couple of months ago. I think they are still investigating and trying to tune the settings to get rid of bottlenecks.
There are other posts already on this topic so if you need more information. Try searching for posts the last 2-3 months (not during peak hours when everything might be slow). This is one of them https://discuss.eroscripts.com/t/server-performance/142831