Wi-Fi issues with Mountain Lion 10.8.3

Santo20

macrumors newbie
I purchased a 13-inch MBP which came with Mountain Lion on it.Recently,when I was using internet via Wi-Fi tethering using my iPhone 5 I found it very slow.On the other hand via USB tethering it is very fast.
I have tried:
  • Renewed the DHCP
  • Changed the MTU from Automatic to maual with 1453 to prevent dropping of packets

And still I find the Wi-Fi tethering very slow... Please give me a fix!
 
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