Another build in laptop wlan adapter:

Network controller: Intel Corporation PRO/Wireless 3945ABG [Golan]
Network Connection (rev 02)

iwconfig wlan0
wlan0     IEEE 802.11abg  ESSID:"xxxxxxxxxxxxxx"  
          Mode:Managed  Frequency:2.412 GHz  Access Point: CC:5D:4E:1B:46:44   
          Bit Rate=54 Mb/s   Tx-Power=15 dBm   
          Retry  long limit:7   RTS thr:off   Fragment thr:off
          Power Management:off
          Link Quality=44/70  Signal level=-66 dBm  
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:46   Missed beacon:0

 ping 10.0.0.138
PING 10.0.0.138 (10.0.0.138) 56(84) bytes of data.
64 bytes from 10.0.0.138: icmp_seq=1 ttl=64 time=0.911 ms
64 bytes from 10.0.0.138: icmp_seq=2 ttl=64 time=0.873 ms
64 bytes from 10.0.0.138: icmp_seq=3 ttl=64 time=0.869 ms
64 bytes from 10.0.0.138: icmp_seq=4 ttl=64 time=0.868 ms
^C
--- 10.0.0.138 ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 3003ms
rtt min/avg/max/mdev = 0.868/0.880/0.911/0.027 ms


All diference that i can see is only wirelees standarts that is suported by 
adapters:
netgear IEEE 802.11bg and intel IEEE 802.11abg.

and some dependences:
modprobe --show-depends iwl3945
insmod /lib/modules/3.11.0-2-lowlatency/kernel/net/wireless/cfg80211.ko 
insmod /lib/modules/3.11.0-2-lowlatency/kernel/net/mac80211/mac80211.ko 
insmod 
/lib/modules/3.11.0-2-lowlatency/kernel/drivers/net/wireless/iwlegacy/iwlegacy.ko
 
insmod 
/lib/modules/3.11.0-2-lowlatency/kernel/drivers/net/wireless/iwlegacy/iwl3945.ko
 


 mabe this module eeprom_93cx6.ko makes problem with rtl8187, but to check it 
is out of my qualification...

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https://bugs.launchpad.net/bugs/802902

Title:
  Realtek rtl8187b wireless chipset slow speed

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