Spigot/bukkit alternative?

Hello,

I currently host a small private server, and I'm looking for an alternative to spigot/bukkit. There are a few things I would like it to have:

1. Allows iron titans/other 1.8 iron farms to work.
2. Doesn't make my internet run super slowly*

*I need this because when I ran it on vanilla no one could use our internet.

Any help is appreciated.

Thanks,
Set3