We have 12 macs in the office that currently talks to a mac mini over our wireless network. We found that it's extremely slow accessing the network drive. Would it be possible to link up all the macs with a hub over ethernet but still route all the internet traffic over the wireless to the router?
P.S (our mac mini is not wired either so no, we can't use that as a router).
You can, though a smarter way of doing it would be to eliminate wireless altogether by attaching either a Thunderbolt to Gigabit Ethernet adapter to your Mac mini (if it is a 2011 model) or by using a USB to 10/100 Ethernet adapter (if it is a 2010 or earlier model) and connecting a cable from that port to the source of your internet. Wireless is relatively unreliable and results in what feels like a slower connection.