A small freeware tool for Windows Vista / 7 (XP with limitations) disabling the periodical background scan activity for wireless networks. It improves latency time of wireless connections. Hence it is useful for people with wireless connections getting lag spikes (especially during online gaming, audio and video streaming). The application automatically tries to optimize your wireless connection when started. If it works for you, you can make it launch when Windows session starts (e. g. minimized to tray). Closing WLAN Optimizer will restore Windows standard values.
Version 0.21 Alpha contains three different tweaks: Disabling autoconfig (not recommended), disabling background scan (recommended), enabling streaming mode (recommended if disabling background scan alone doesn't work).
If Version 0.10 Alpha worked for you, version 0.21 Alpha should also. Just activate the "Disable background scan" tweak and leave the other tweaks untouched. If you experience problems, you can also try enabling streaming mode. Disabling autoconfig is not recommended (it's pretty much the same as disabling background scan, but you won't see any wireless networks in Windows).
You can make it start with Windows (e. g. minimized to tray). The tray icon will display the selected device's state (blue when connected, else grey).