The iMac G3 is a 2002 model, has a 600 mghz processor and 1 GB RAM. It does not have an AirPort wireless card and Apple no longer manufacturers an AirPort card for this machine (which I bought used), so I bought a USB wireless adapter that appears to pick up a pretty strong signal from my Verizon FiOS router, strongest of course when parked next to the router. Unfortunately, I am only able to generate 3.5-4.2 mbps download speed no matter how close I am to the router, whereas the machine can consistently download at 12-15 mbps with a direct ethernet connection. The FiOS router can download at speeds in excess of 20 mbps. Is there some setting I'm overlooking that can improve the wireless connection speed or am I going to have to settle for wired use only?