"Now thats what I call minecraft" mod compilation: Which one lags?

You are probably having the same problem I had. The bunnies tend to take over and everything lags. If you have Single Player Commands the fix is easy. First set the bunny spawn to 0 then use the "killall bunny" command. This isn't a permanent fix but the first time I did this over a thousand bunnies were killed. I think there's a bug in their spawn code so I have to do a bunny purge every so often if I want to see other animals.