Its a long list, but the main items for the unraid server is PRIME X399-A Mobo, 64GB DDR4 RAM, Threadripper 2950X, Quadro p2000, & Samsung 980 1TB NVME for appdata + Samsung 970 EVO 500GB for plex appdata by itself. Network is all unifi - UDM Pro, 24 port switch, 48 port PoE Pro layer 3 switch, all cat 6a & 7 cabling. There is a ton more, but thats thats the meat & potatoes. While there are far better servers here, this is not one that should have this issue. Especially the docker page.
It takes more than a few seconds for me usually, but I understand your point.