BleepingComputer.com: Help With Wireless-n Router

Recently, I have acquired a wireless router. It is a wireless-N router(310N) from linksys. I was formerly using Wireless G, but this was given to me as a gift so I switched it in.

Anyway, since installation I have the following problems:

Slower page loads.
Random lag spikes and disconnects. This occurs in both WoW and Warcraft 3. I don't play other games.
Much slower download times, especially considering the relative increase in speed. Also unable to download more than 1 thing at a time(doing so brings it to a crawl)

Any help? I was running a WPA encryption, but turned it off because I thought it might be the problem(I didn't have an encryption before)

The speed shown has more that doubled--before, it would max out at 54 MBPS, now, 130.