My friends and I have decided to make a private server that we decided to mod. The mods work, but we have extreme amounts of lag.
The specs of my computer are as follows:
Core i7 3.9Ghz
16GB DDR3 RAM
NVidia GTX GeForce 660
2TB HDD
120GB SSD
I'm the one running the server. Normally, on vanilla minecraft there's a little lag but not as bad as it is currently.