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I have a NAS (Network Attached Storage) Drive, that is 100MB full, and if I were were using wireless to tranfer data to and from my external drive my backups and file transfers would take twice as long. So if you have desktop computers I always recommend using ethernet cables for maximum transfer throughput. Wireless is only for portability of laptops, but you do suffer on transfer speeds.
Note: Most ISP’s even broadband rarely top 8mbps, so therefore wireless won’t really notice any speed performance impact when browsing the internet. You notice the loss when transfering large amount of media between computers and servers. I do Digital Video recording and a ten minute video can be 400mb or more, this would take much longer to transfer via wireless than with ethernet cable.