Some interesting things:

1. I did some tests by creating another Networker v7.3.3 server, adding 
some adv_file devices and a storage node. When I run cloning from the 
server to the SN through network, the speed is about 26.6 MB/s. 

2. I upgraded the server to v7.5.1, but leave the SN unchanged, run 
cloning again, the speed dropped to 18MB/s.

3. Upgraded the SN to v7.5.1, so both the server and the SN are in v7.5.1. 
Run cloning again, the speed is even lower, 15.2MB/s.

So cloning in v7.5.1 is denifitely slower than in v7.3.3. 

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