FTP Upload Lag's Box

[hakkuo23]

So, I'm backing up files from another VPS to ANOTHER VPS using FTP. However, even at an upload rate of 100KB/s, it's lagging other services on the box (nginx particulary) so my question is, how can I fix this to allow a 1MB/s upload without lag? They are large files (zipped up) so it's a persistant download. I thought that each vps has 1GB/s uplink allocated to it, so I'm a bit perplexed.
I look forward to being told

[Edge100x]

The VDS has a 1 Gbps connection, so it wouldn't be the network component causing problems. Do you only hav ea single-core and are running out of CPU/memory?

[hakkuo23]

I'm uploading from a 1core to a 3core VPS. Windows to Linux.

[Spray]

Are you doing this via a backup script? Consider running this with the 'nice' command to reduce CPU priority. Something like: nice -n 19 /scripts/backup.sh