Lotus Domino slow performance

Hello,

we have a nre BE 2012 installation.

We use offhost backup (good permance), VMware and Hyper-V (good perfomance).

When we backup AD, DFSR, Lotus we have slow perfomance.

For example I'm backing up a Lotus Domino (8.5) server that is installed in a Domino Application Cluster.

I've got installed the BE Windows Agent only on one node of the cluster.

The job of this server ends succesfull, but the job rate is only about 650 MB/Min.

I think thera are not network related issues, if I copy some GB of data, from the Domino server to the Media server, I reach 3000 MB/Min.

Any advice?

Thanks.