The following would only work for wired non-notebook computers
Go to Gigabit Ethernet Cards and Switches.
One Point of improvement would be to increase the speed of the network traffic. Most computers are shipped with 10/100 cards.
Increasing the speed of the network traffic would also speed up the delivery of the data to the computer. Remember the computer would also need to be able to "consume" the data at the rate it is being delivered or there will be no appreciation in speed at the client machine.
In simple terms even if the data is being pushed around the network at 1000mbps if the computer can only accept 100mbps, the computer will not see any appreciable performance.