Airport (very) slow, ethernet fast, only my Mac affected

Dear community,
I experience a weird problem since some days which gives me a headache. Following situation:
- Airport is connected with my router properly
- I experience very slow connection speeds
- Other users within the same network do not have any problem
- When connected to the same router with ethernet: normal speed
What makes the issue totally absurd is that I dont have any slowdowns in other networks using airport. Any suggestions?
My config:
[IMG]http://img804.imageshack.us/img804/8265/screencapture5.png[/IMG]
[IMG]http://img713.imageshack.us/img713/6113/screencaptureh.png[/IMG]
[IMG]http://img23.imageshack.us/img23/3849/screencapture1cd.png[/IMG]
[IMG]http://img29.imageshack.us/img29/3098/screencapture2wx.png[/IMG]
[IMG]http://img194.imageshack.us/img194/1570/screencapture3vq.png[/IMG]
[IMG]http://img689.imageshack.us/img689/3961/screencapture4w.png[/IMG]
[IMG]http://img809.imageshack.us/img809/1599/screencapture6.png[/IMG]
[IMG]http://img153.imageshack.us/img153/778/screencapture7i.png[/IMG]
Speed test with Ethernet:
[IMG]http://img204.imageshack.us/img204/5348/screencapturel.png[/IMG]
Speed test with airport:
[IMG]http://img94.imageshack.us/img94/5631/screencapture2d.png[/IMG]
What da hack is going on?

I have the impression that the speed is slightly increased, but that does not make that much sense to me. So I checked speedtest.org.....still very slow.
Any other suggestions?
http://img695.imageshack.us/img695/9056/screencapture143204.png

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