Pixelspark mod (pixelmon) lags a lot, works fine for my friend?

So my friend and I were playing pixelmon on his server and we rarely lagged, and even then it would just replace a block we would break, then come back to normal
Now, when I try to host a pixelmon server, i get this abominal lag that just rubberbands me where i was 2-4 seconds ago (i opened the console and i once had a 4500 ms lag!)
I want to know why for him it was working good, and for me its just unplayable. I also want to know how I can fix this

I get 10 mbps download, I have tried on BOTH an already existing world, and a new world, same thing.
I can also assure you that after we had a 300-400 mb world, the server ran just fine.

That was after about 4 days of continuous exploring and chunk loading.

Quote from Andreas

It wouldn't matter if your ping were sh*t anyways.

Your large world is probably causing the lag now.

"So my friend and I were playing pixelmon on his server and we rarely lagged"
"I have tried on BOTH an already existing world, and a new world, same thing."
speedtest says i have 3 ping.
When testing from germany, i have 35 ping.

yeah hope it works then, but his server ran good at peak hours too so thats a thing...