Copying files through Deployment Server is slower than Direct via UNC.
Deployment Server 6.x
Copying files through Deployment Server is naturally slower than Direct via UNC because Deployment Server copies report information such as % Complete, and supports Resuming Failed File Transfers.
Deployment Server copies will never be as fast as Direct UNC copies. However, you can fine-tune the number of File Transfer Threads your Deployment Server uses to optimize the file transfer rate.
To do this, follow these steps: