Board Thread:Questions and Answers/@comment-10940479-20130616194325/@comment-8540798-20130618075311

Holy moley, that's a lot of Mirrors! Was my setup slow because I didn't have enough mirrors, and only one boiler then?

and of course, all five slots of the Crystalliser. Having a moment...

I don't think the modder has updated IC2 to 1.5.1/1.5.2 yet, which is why it's absent in the 'Tekkit' modpack.