Something just occurred to me. The whole point of Ethereum is to act as a giant global computer. Currently that computer utilises many thousands of GPUs.
When we switch to Casper I will end up mining something else and I will stake my Casper wallet on something like a raspberry pi, I'd imagine that lots of other people will do the same thing.
I understand that things will be more efficient without PoW but surely this huge drop in resources will impact the performance of smart contracts?