Yes, miners are stupid.
66% of the miners are mining with the 30% slower miner. (alexis 1.0 legacy code)
live from one of the pools:

The total nethash of renesis today is around 50GHASH. This is around half the hashrate of the Bitcore network...
(The renesis gpu miner is only abit slower than the bitcore miner, so the nethash can be compared.)