Hey kid, you're new to the forums so I'll give you this one. We've talked about it already. This and every topic you've brought up since you started your account. Every one.
You might not have been around to notice, but there were changes made to pets. Fireworks and weather effects are not server side, so they don't contribute to server lag.
As I previously stated, one house with a couple dozen bug animations makes little difference. Tracking the location and randomizing movement of some 50 or 60,000 interactive bug NPCs, however, makes a difference.