the server has been in the process of starting for several hours

the server has been in the process of starting for several hours. If I'm not mistaken, it may be due to newly added mods that need to be downloaded and installed on the server. If so, is everything okay despite occasional server stops or restarts, or is the problem elsewhere ?

Thank you for your answer.

I deleted the mods and set up a new map with a new save to see if they caused this problem. Well they caused it, so I gradually added one and restarted the server, then I connected to the server. I repeat this every time I add another, to know specifically that the mod is in conflict or slows down the start of the server too much.