I lag whenever my grandparents watch/play(simple online checkers game) on his chinese program called PPStream. But here's the real mystery, there's no lag when i or my brother is watching videos on youtube. My grandpa and I both use the Ethernet and my brother on the laptop uses the WiFi. The router i'm using is "150M Wireless Lite N Router" Model No. TL-WR740N. I would be very grateful if someone could enlighten me on the situation! Thanks in advance!!