SQL 2012 Database Mirroring Issue is stalling

hi All,
I have a SQL 2012 Enterprise Primary and DR SQL Clusters.
I have a 500 GB TDE Enabled Using HSM SQL DB which I have mirrored across to DR.
I am noticing that my Logs are shipping to DR, but the Unrestored Log size is huge and My restore rate is about 0 - 80KB/Sec. This is Causing the unrestored
Log to grow on the DR side.
I also notice at times my Unsent Log is also getting big after any DB Maintenance activities (such as rebuild of indexes).
I have a dedicated connection between my datacenters and the traffic thruput is quite reasonable and I am able to copy out a 2GB File across within a few
minutes. I see no packet drops within my links.
How do I ensure that my unsent logs are copied out and also increase my restore rate in DR side.
Any help / Suggestions will be much appreciated.
Regards
Aravin.

You need to limit the amount of reindexing you do on your primary/principal as it generates a lot of logs which slows down mirroring and log shipping.
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