Thanks for the help and ideas with wlanpoke.
I finally installed now after i found out how easy it is (ofter i found the extension and then found out to activate it also and waited then 24hours) Feels really snappier and more stable, less Buffering.
And since i moved the one Radio wich started to lost wifi again and again (even with greart signal from a very near Hotspot, it is now stable since 3 Days. Keep fingers crossed