EX4 speed poor?

transferred from My Cloud forum:
I have used my MYCLOUD EX4 for backups and notice they take a long time to complete, especially when they are large. I am testing the speed by copying a 1 TB file from my computer to the MyCloud. So far it has taken about 14 hours and it’s 78% complete. The copy throughput is between 4 and 20Mb/s. Both the computer and the MyCloud are hardwired to the router with GB/s speed.
A backup that I do to a USB attached drive takes 3 hours (about 800Gb) and it takes 24 hours when I do the same backup to the MyCloud.
The MyCloud is using red 4TB WD drives and is RAID5.
Is this normal? If not where should I look for the constraints?
Thanks

I have 40MB/s transfer speed rate using Samba (Windows shared) folders via 1Gb/s Ethernet connection. (Jumbo-frames ON and SMB2 function OFF in Network services setting)

Well the response to issues and questions on this forum is not very good. The people on the forum must all be people like me, people with issues and no real expertise. Can anyone suggest another forum that might have a more technically aware membership?

If you can try using afp. My transfer speeds went from 20Mb/s to 80Mb/s

zemun2, what is “afp”?

What is afp?

Apple Filing Protocol.

Enable AFP and map your share as afp, if you have mac.

I guess this is just a cached result - i connected the EX4 directly (cross over) to a own 1Gb/s Ethernet port. And the average real speed is at around 14MB/s uncached. Cached it shows also 40MB/s but that speed rate declines if the cache effect is neutralised by very large files.