I'm experiencing a similar issue, but I'm not sure which version it started on.
When I copy a file to my cloud drive, it saves it locally, and then uploads it to the cloud.
The problem is that it is transferring the file VERY slowly to the local drive area.
I was transferring @ 10 MB/sec to an SSD.
I decided to try another drive to see if something maybe was taxing the drive .
I created a VHD on another HDD I have ,attached it to my host, and let it run the Cloud Drive on there.
Now, I'm transferring @ 2 MB/sec, if I'm lucky, on this HDD.
If I take Stablebit Cloud Drive out of the equation and try to copy from/to these drives manually, I get 100 MB/sec and upwards.
Since this issue has nothing to do with the internet connection, what do you think may be causing this?
Look at the below image.
http://i.imgur.com/xeo3P1g.png
These two transfers are from the same physical source HDD to the same physical destination HDD.
The top one is being transferred via Stablebit CloudDrive's mounted drive.
The bottom one is being transferred directly to the storage where the "CloudPart" files reside.
http://i.imgur.com/j2NPdEY.png
If I wasn't doing them both at the same time, I would be getting ~2.5 MB/sec on the Cloud Drive transfer and ~100 MB/sec on the direct transfer.
To add,
I was never able to fully use 100% of my HDD speed when transferring to the local area of Stablebit CloudDrive, but I was able to use much more than 10 MB/Sec. I think it used to transfer at 60-70 MB/sec or so.