Talk:Gems/@comment-6703163-20130223203816/@comment-6195125-20130227163839

Upgrading the breeding cave will also cut the breeding time by 20%, and it's cheaper by 50 gems, so I'd go for upgrading the cave first. If you upgrade the cave/island you speed up the process for every dragon you breed, not just when you spend the gems on individual dragons.

I don't know what the cost is to upgrade the hibernation cave, but you could probably upgrade the shrines for close to the same price.