Lag

Hello, i am experiencing server-lag.

My server is running with the Modpack RlCraft and with the Version (automaticly that is the version btw) 1.12.2.

Example: i can break a block and it takes like 5 seconds for it to actually break, and i can walk a little distance and get teleported back.

Thank you for your time.

So it's just the pack itself which is too big?.