Sloth can you share your php flarum info output? Is there anything in Flarum log files at <flarum>/storage/logs ?
What kind of hosting is that? Where is the database hosted?
I can confirm the incredibly slow loading times and timeouts. But it's very hard to tell what can cause it since it appears to be server-side. There could be issues with the database server, particularly if it's hosted on a different host. You could be throttled by your host, or by Cloudflare. You could have a very badly implemented Flarum extension. Or maybe something completely different running on your VPS eating up all resources.