freebsd hostapd wlan performance

[psunix]

Hi

I've setup an accesspoint on my freebsdbox with hostapd.
It works but the performance is very bad and there are also timeouts sometimes about 30s until a website in my browser is loaded.

Here is my hostapd.conf


# hostapd.conf
#

interface=ath0
driver=bsd
logger_syslog=-1
logger_syslog_level=-1
logger_stdout=-1
logger_stdout_level=0
debug=1
dump_file=/tmp/hostapd.dump
ctrl_interface=/var/run/hostapd
ctrl_interface_group=wheel
## IEEE 802.11 related config
ssid=sit
## WPA/IEEE 802.11i config
wpa=1
wpa_passphrase=secret
wpa_key_mgmt=WPA-PSK
wpa_pairwise=TKIP


freebsd 7.0
Atheros-Based Netgear WLAN-PCI-Card (ath0)

I've tested the wlan with my Macbook, iPod, a windows notebook and also with a ubuntu machine and had always this problems.

Does anybody know where is problems may come from and how to fix it?

Thanks for your help

Psunix