Wifi acting strange on Macbook Pro?

My macbook pro has gotten terribly slow over our home internet recently. i mean very recently. like i would say this started happening on friday at most. On my top floor my wifi has suddenly gotten very slow. I pay for 6mbs with ATT Uverse. On my middle floor [where my router is located] I get normal/decent speed around 5.2-5.8mbs but on the top floor ive started getting around only .2-2mbs . this might be normal except for the fact that ive had uverse for years and this HAS NEVER been a problem. the OTHER thing is that my iphone and ipad on the top floor still get the speed of 4-5.5mbs. My desktop imac which is 3 months old and is located in the same room as the router is also getting very good speeds. the speeds have gotten so bad on my top floor on my macbook i can no longer use the internet and definitely not use youtube. the thing is the slow speeds on my top floor are only affecting my macbook and not my iphone and ipad. my iphone and ipad are still getting 4-5.5mbs on the top floor. i dont have another laptop to test the speed with. i work from my bedroom so i need the wifi to be decent up here which it is not. my macbook pro is around a year old and is running Mountain lion (but i updated a while ago). is the wifi signal on my macbook just getting bad/weak or is it my home internet? i also remember this occurrence when me and my friend were at school (both has same model macbooks) and i was right next to her not getting any wifi signal and she could. help this problem is getting bad and i need internet for school work.
by the way all tests were done through speedtest.net and were run several times to test for consistency
also my PING is the same as it used to be (around 29-31)
and just to stress it, my macbook used to be getting decent speeds like 5.5mbs on my top floor till recently. there has been no additional devices added to my network and my router has not moved, so i have no idea what could cause this problem. please help! thank you!

What version of Mac OS X are you running?
If you live within range of several neighbors with WiFi Routers, you may be getting competition from them. The brute force approach to this is to cycle the power on your Router. When it comes up, it usually sniffs around and assigns itself the lightest-loaded channel.
Some users have had success by setting the WiFi block size to slightly lower than the default 1500 characters -- to say, 1430.
system preferences > network > WiFi > Advanced > | Ethernet |  Configure: Manually  > MTU : 1430
Then ( Apply ) and close the window to take effect.

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