Firmware 7 beta with Balance One Core

I tried firmware ver 7 beta on Balance One Core which works as WLAN controller and after firmware upgrade Balance started to work at least 2x slower. The same whole network.
After downgrade to 6.3.3 everything started to work normally. Is it any specific config parameters which I should use for ver 7 at the Balance One ?

Have you tried the latest RC? Firmware 7 is Now RC, New Feature!

If the problem persists, please enable RA and PM @lai the serial number for troubleshooting. Thanks.