Wlan connection slow

Hi,
since a few days I have big problems with the WLAN-connection of my late 2011 13" Macbook Pro that leads to very slow Intenet Connections and Slow SMB-Server access.
In Detail: If I will open a Webpage it will take 50 times longer then from my iPad or Windows PC; and I run an Windows 2012 Server as an Data Pool, if I will access to any Remote Hard disk the Mac will need 5-10 sec. to load a Folder (the Windows PC loads it directly after the "klick").
Intristingly, If I am connected via LAN (T-based 1000 Mbit Gigabit Ethernet) everything works extremly fast.
Does anybody have a Idea to Solve this Problem? I run Mountain Lion in the latest Version, nothing has changed the System since or before the Error occured.
Thanks....

Yeah there is....
CCX - AironetIe Support.......................... Enabled <-- disable this
DTIM period for 802.11a radio.................... 1<--change to 2
DTIM period for 802.11b radio.................... 1<--change to 2
   Wi-Fi Protected Access (WPA/WPA2)............. Enabled
      WPA (SSN IE)............................... Enabled <-- disable this
         TKIP Cipher............................. Enabled <-- disable this
         AES Cipher.............................. Enabled <-- disable this
      WPA2 (RSN IE).............................. Enabled
         TKIP Cipher............................. Enabled <-- disable this
         AES Cipher.............................. Enabled
      Auth Key Management
         802.1x.................................. Disabled
         PSK..................................... Enabled
         CCKM.................................... Disabled
Swotch configuration should look like this:
description connection to wlc port 1
switchport trunk encapsulation dot1q
switchport trunk native vlan 9
switchport trunk native allowed vlan 9
switchport mode trunk
description connection to wlc port 2
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 99
switchport mode trunk
description connection to wlc port 3
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 103
switchport mode trunk
description connection to wlc port 4
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 102
switchport mode trunk
description connection to wlc port 5
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 100
switchport mode trunk
description connection to wlc port 6
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 101
switchport mode trunk
Thanks,
Scott
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angel_apm wrote:
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