Here I am again
Well, I contacted to my Shell's Technical Support Service and the answer was:
-"No, we do not throttle or filter outgoing traffic
The server is connected via a 100 mbps link and is barely using 200 kb/sec.
We have not received complaints from anyone else.
Can you try connecting to IRC using BitchX or another program (like bnc) to make sure it isn't an eggdrop problem? Have you also tried connecting the eggdrop to a completely different network like Undernet or dalnet?"
I did it and... yes! there is no lag (ping reply never up to 1 second) using BitchX
... maybe there's something wrong on my eggdrop.conf ...