If you have Cat5e or Cat6 cables it will help, also having gigabit devices, router with gig ports, network adapters and gig network switches, this will all help with the transfer rates in your wired connection and again for wireless connection, an N technology also helps. For now, you may try my other suggestion on changing the Link Speed & Duplex whether or not your network adapter has the 1Ggps, try the 100mbps full duplex.
I've given you all different types of suggestions, if you can afford to upgrade and invest on the latest technology it is a great option.