I've had this same issue intermittently, going on like 3 years now.
They really should have migrated their boards in anticipation of the EA. Failing that they should have migrated their boards in anticipation of the actual launch. How much does it cost to get some decent boards? I thought we were raking it in here lol. I mean low hanging fruit.
It takes me roughly 90 seconds to load a topic on these forums bookmarking straight to the BG3 section. Loading the main forum directory can take like 3 minutes sometimes just spinning wheels. Often it feels like I'm in a cabin in the woods waiting for a satellite to pass overhead, not chilling in suburban Cali with the fiber and a cable plugged straight into my rig from the wall. Pretty middling. I guess we got a couple custom emojis and a grip of legacy from their previous titles, but I'd rather have boards that could handle image attachments without relying on 3rd party hosts, and some flavor that's like specifically BG3 oriented, cause I really don't care about Divinity or DOS or DOS2 or the German language versions of each, which all load simultaneously. Bookmarking directly to the BGIII forums categories helped a bit, but this always seems to happen whenever there's a new patch or something that pulls a big influx of traffic. like say the release of the full game hehe. I mean seems like something we could have seen coming hehe