Just some additional info after dozen of hours (hundreds?) playing 1.2.0.70 on official servers :
- At the biggest peak times (days after the update 1.2.0.70) : all servers experienced server FPS decrease, packet losses increase, most of the time leading the server to crash.
- Still these days at peak times : US server seem running way better than EU (still some lags at peak time but US servers crash rarely in comparaison with EU servers).