I pretty much have the same issue as this guy has:
viewtopic.php?t=266910
he resolves by using NTFS. But has anyone resolved by using CIFS?
read speed form NAS 100MB... write speed 8MB, what gives?
slow cifs writes to NAS
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Re: slow cifs writes to NAS
found a workaround.... I was transferring an iso file to my wd mycloud using cifs.... if i transfer the file on its on (just the iso file) speed was 8mb
if I transfer the file when its inside a folder its writes x10 as quick
wierd city
if I transfer the file when its inside a folder its writes x10 as quick

wierd city