I'm getting a little lag. I'm out at my grinder but I'm not even getting close to the mob cap and I'm logging off every once and awhile to enchant on Smp 7 so it has to be something else.
Do you have major redstone contraptions? That, lava, and fire all seem to make me lag a lot. Or maybe a neighbor nearby has something of these they just put up.
Fireworks do cause a lot of lag I saw one guy on smp2, piggy in a mine cart redstone clock, fireworks never stopped >.<
"Please do not leave Automated Firework Launchers running 24/7... Do them for events only then turn them off. If found running them 24/7, we will take action." Straight from the post.