The lag is usually a symptom of low throughput, which can be caused by interference.
A delay of one second is still normal but you may want to optimize the network environment by using the least crowded network channel; in 2.4 GHz the non-overlapping channels are 1, 6, and 11 (5 GHz DFS channels are not supported for Intel® WiDi). You may view your surrounding WiFi networks with programs like WifiInfoView or inSSIDer. Walls and other objects may disrupt the wireless signal too.