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The first bottle neck I'd check would be your connection 100MB/s, 5MB/s isn't great but it won't improve by much unless you go 1G or 10G.

I'm assuming you're probably not running on SSD / fast HDD or top of the line RAM/CPU. Which is fine as it should still work but not very fast, on top of your sluggish network all of a sudden 5.3 MB/s doesn't sound that bad.

Just to put figures in perspective, found the below on some website:

*M = mega m = milli B = byte b = bit

When referring to disk usage, we measure throughput in megabytes per second, or MB/s. Notice the capital M for mega and the capital B for bytes. When referring to network performance, we measure throughput in megabits per second, or Mb/s. Notice the lowercase b. A bit is eight times smaller than a byte. You can figure out your 100Mb/s network's maximum theoretical throughput in MB simply by dividing by 8. 100 / 8 = 12.5.

TCP/IP has ~ a 10% overhead, as does Ethernet, so realistically you'll only see about 80% of that at the high end. A little more basic math shows that 12.5 * .8 = 10. You should expect to be able to write at about 10MB/s over your 100Mb/s network. This lines up perfectly with what you are seeing.*