Mike,
Hi, I do think its slow compared to just running a backup, which can also be very slow sometimes. For me, doing a standard backup, speeds can vary on the same server from 0.5MB/s (30MB/m) to >50MB/s (3000MB/m) depending on what its backing up. One of my servers takes 5 days to do a full backup (which it just completed today from a Friday full backup, well it didn't complete, it couldn't backup the system state for some reason so failed), this is one of the servers that I wanted to use CPS on, so that it could sync all the files to the other server and just copy over, when changed, any other files, as it takes so long to do a normal backup on it. So the initial sync time didn't really bother me, as it takes so long anyway to copy files across from this server anyway (averaged this time 41MB/m). But this is the server that becomes unresponsive when using CPS on it, and also the server that has 15,000,000 files.
But what I'm trying to say is, as long as it works, and it keeps the files in sync, it shouldn't matter that it slow on the initial sync, unless you are doing a scheduled sync every few hours and lots of files change. I'm not saying it has nothing wrong with it, I do think it should be improved, as it doesn't work for me, for what I want it to do. But I have yet to look in to the reason why the server becomes unresponsive.
David