The server at zimmy99.org is now running vanilla 1.15.2. The huge 1.14.4 world has been archived. The squeaky clean and very fast 1.15.2 is now installed and running :D.
Luckily the pack is still being updated, and we got version 2.5 about 2 weeks ago. I recently updated the server and all seems to be running well. I added 2 more mods that I thought would be fun to check out, and / or might come in handy :