Effects of 's  mining crackdown in 3 charts: 
1)Hashrate (mining computing power) down 55%. Why is this an issue? 
2)Mining difficulty adjusts more slowly, down only 21%. 
3)New blocks of tx now take 15 min to clear, instead of 10

source: https://t.co/m3jrUKKgMq https://t.co/HqGaWfvGE0