ipropd slow when pushing complete database

I sometimes push the entire master database to a replica. I do this 
using ipropd. The process is to stop ipropd-slave on the slave, delete 
the database and log files, and then restart the ipropd-slave service. 
The entire database is then pushed to the slave.

When pushing the database via ipropd to a traditional VM the process 
takes a very long time, upwards of 5 to 6 *minutes*. I also get these 
speeds when pushing to a stretch container running as a slave. In the 
past, when using Heimdal 7.1 and pushing to a jessie container, the 
speed was quite fast, around 10 seconds.

For comparison, I did an scp of a copy of the database file from the 
master to the slave, and that only took about 6 seconds.

I realize that doing an ssh copy is not at all the same thing as doing 
an ipropd copy from version 0, but something must be wrong if the ipropd 
copy is 50 to 60 times slower.

I am running Heimdal version 7.5 on Debian stretch machines. The 
database file is around 430 MB and the log file is around 23MB.

Anyone have any troubleshooting steps to find out why ipropd is so slow?

Thanks, Adam Lewenberg