Hey @mAritz
This long loading issue originated by some assets could be caused by a couple of reasons. First is the use of mods. Some have not been updated to be compatible to the latest version of the game and could cause issues by themselves or in combination with other mods. The other could be the hardware where the server is hosted on. Keep an eye on RAM and CPU usage when hosting a server, if possible, especially when using mods or hosting it in the same computer as the one you’re playing the game with.