We are currently seeing degraded network performance to China using our AS4837 route, this is caused by a cut in the APG submarine fiber cable AS4837 uses.
Degraded performance may continue until this fiber cut is fixed.
We've been informed that one of the currently offline submarine fiber cables is due to be fixed on 20th August but there is still one other offline with no estimated fix date so performance may still not improve to previous performance levels.
Throughput at peak time has dropped to very low levels, less than 5Mb/s multithreaded. Ceranetworks has confirmed they're seeing significantly lower traffic levels meaning the fault is still within China Unicom's network.