Maybe look at this?

Thats a suggestion? He confirm it was lights that shot up usage anyway. But too many NPC's as well all know also affect CPU usage.

Notch's reply: "oh! Thanks"

~3 hours ago.

Heh, that "Oh, thanks" seems rather more like, oh bugger, not another broken feature.

It was confirmed earlier in a twitter post that lights do affect CPU useage.

The new Minecraft.net sure is stable! And from playtesting, I agree that the monster spawning brightness torch thing stuff now totally sucks
about 5 hours ago via web

From his twitter.

well, let's just disable torches & do a mass remove of brittle gold problem solved.

notch even thought he is a genuis likes to take his pretty little time

well, let's just disable torches & do a mass remove of brittle gold problem solved.

conathan

you mean lightstone?