If a unmodded server starts in normal time but a modded one doesn’t, then this points a finger at the mods - in which case I’d be asking the developer(s) of the mod(s) in question. Not an AMP issue or something AMP has any control over.
I have had modded servers for over a year, self hosted. This is the first time I’ve ever run it on Linux and AMP and never before it took so long. I really have only four heavy mods, the others are msot lightweight of mods. Before this I had modpacks with 2x the amount of mods all of them added housands of assets combined. Never took so long to load a server.
Regardless, not an AMP issue. AMP just starts the server executable. Anything that happens after that isn’t under AMPs control, and it’ll behave the same way outside of AMP.
By definition, if the slowdown doesn’t happen without the mods - then it’s the mods fault. Try removing some and adding them a few at a time until the problem re-appears.
Of course it might be an issue on my side, somewhere I’m not sure if I can read it from some log or somewhere? Because when I first add the mods it launches pretty quickly and slows with consecutive restarts. I’ve had a Windows version of AMP on this machine (Dual boot) and with same mods the server launched in 5 minutes.