Incredibly slow connection over WIFI only on Mac

Hi,
I have the following problem that cannot fix and I need your help.
I have a 10Mbit fiber optic ISP connection and a Belkin wifi accesso point.
In the same room I have an iPhone, an iPad and a PC succesfully connected and up/downloading at full speed (up to 900K).
The problem is on the Mac that can't go faster than 10K !!!
Sometimes it also drops and cannot see the wifi for a while. I tested also with all other devices turned off and the access point freshly restarted.
Any idea?
thanks a lot

update/more info
when connected via ethernet cable the speed is very fast, so I guess no disk fragmentation issues
also, sometime the connection to the access point breaks and I can't find it on the airport search (I don't see any other access point). All this while the orhert devices do see many wifi in the area and easily connect to mine at top speed.
definitely the issue is on the Mac.
forgot to say, my belkin is set with a WPA2 password.

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