vSphere Replication is too slow compared to bandwith

Hi,

I replicated Vm's from local storage on PS, to local storage on DR site via vSphere Replication 5.1. For my test purpose I set RPO on 15 min. Link between sites is 1Gbps (test link)

I messured traffic regarding vsphere replication and results are dissapointing. Max speed is only 30-40 Mbit/s. Conclusion is that vSphere Replication algorithm can't use all available bandwith. Local Storage performance are not problem, copy paste on vmfs works with arround 800 Mbit/s

Anybody else with this behavior?

Thanks,