Q: WIFI and MacBook Pro: not a good pair!

I have over the last few weeks had problems with the network.

I have a wireless router standing in the living room, one TL-WR841N, for my 100 m / bit connection that really has worked fine for a long time. However, it is now beginning to be extremely slow on my Macbook Pro while my windows laptop or iPhone do not have the same problem.

When I use the web on my mac is a kind of delay - ie. that when I enter a page or the buffer is so slow or it just completely jumps of the WIFI.

I have researched a lot on the net about the problem and tried the following:

a Changed my DNS in WIFI properties

b Changed my broadcasting channel in WIFI on the router

c Reset my router to factory settings and made ​​a new setup

d Reset my Mac and put on a new install - it needed anyway.

e Turn Bluetoth on and off

f Tried FireFox instead of Safari

g Turning the router off and on

The most weird thing is when I take a speed test I get a good reading.

Without internet cable:

With internet cable:

The readings are good but the reality is something else.

Please forgive my pictures - they are in danish, but the message is still clear...

Help???