Install a fuddibacke SMP Modpack server through the Control Panel (Servers → Select your server → Game servers → Add Game Server → fuddibacke SMP Modpack)
I wanted a server for me and my friends to mess around with mods without having one of our own accounts hosting the world. Server works perfect and the only real stutters come from the mods we have installed. Easy to set up and configure mods along with speedy times when the server gets updated.