I have a Netgear WG111v3 Wireless networking USB-stick (Realtek RTL8187B chipset) attached to my Pi. This worked out of the box, no problems setting up and getting up and running. Download of any stuff to the Pi is pretty fast, as one would expect. However, pulling things from the Pi, like file transfer using SCP, is unbearably slow! Even the SSH to the system has time lagged output, like if I do dmesg the pages are coming with visible short "hickups". Using wired network is absolutely fine.
Things that show the problem are WinSCP, scp from another Raspberry, Putty. scp transfer rates are around 10 KB/s! Download to the Pi is of the order 1 MB/s+...
I already searched the internet and tried changing the wireless channel and switching of QoS. No changes. dmesg shows nothing suspicious, the iw-tools also look perfect (except for a number of excessive Tx retries, but the count is too low to account for the problem). As an example, here the output of iwconfig (the USB-stick is now lying in 1m distance from the AP, hence the strong signal):
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wlan0 IEEE 802.11bg ESSID:"MyWLAN" Mode:Managed Frequency:2.447 GHz Access Point: <AP-MAC> Bit Rate=54 Mb/s Tx-Power=20 dBm Retry long limit:7 RTS thr:off Fragment thr:off Encryption key:off Power Management:off Link Quality=70/70 Signal level=-7 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:24 Invalid misc:6 Missed beacon:0