As Tom said, whenever files are uploaded or downloaded, the computer needs to you see reported by Dropbox is not simply the transfer speed of your data. NOTE Note that when files are synced, metadata (data about the file) is also transferred which may result in slower than expected speeds. The effect of the. Funny when I download files from a samba box I seem to get better performance, but still not better than 15% utilization. I did a quick search and found this site.