We transfer large media files to and from a few workstations and file servers (audio/video files, as large as 20GB each in some cases) and sometimes I get the feeling the network is bogged down as a result (directory listings can take 5-10 seconds to show up, folders are "calculating size" instead of displaying their total size, etc)
Most of the workstations and both of the servers have a second unused gigabit Ethernet port. I have heard that connecting these to another switch and setting them up as additional routes under a different subnet could be helpful, but haven't seen a recent enough article on the topic to convince me that it is worth it. (I have a spare 8-port unmanaged gigabit ethernet switch, plenty of cat5e, and precious little time)
Does anyone do anything like this or know whether it would be worth the effort?