I'm currently running an FTB Dedicated server with 15 - 20 people on at this time and having a lot of lag. I have checked the dimensions that are being used and i only have the over world on when the lag is happening which is over 70ms. Server is less than one week old. I have Generated the world im using with a border.
FTB infinity evolved 2.3.5
Dedicated server:
i7 4790k 4.0GHZ
32GB ram
500GB SSD
1GB's Upload speed
FTB infinity evolved 2.3.5
Dedicated server:
i7 4790k 4.0GHZ
32GB ram
500GB SSD
1GB's Upload speed