I have noticed that Hashrate has become very irregular, ranging from 1 Mh/s to an astonishing 4 Mh/s. Why would this happen? I cannot explain that without thinking that some big data center gets in and out the network. Needless to say that when the hashrate is 4 Mh/s is makes no sense for a single average computer to mine since that would not produce a single block in days.
In few days we will finish mining pools because we can focus now only on developing pools. The global hash rate seems irregular because sometimes the winner miner is generating a much harder comparing to target. It is something normal in cryptography when you have lots of miners.