I've been tinkering with my DW1820A serial CN-096JNT and other BCM4350. I put in device properties and BRCM kexts in kext/other.
I found out that if you go to BIOS>Wireless>Wireless switch> and turn everything OFF, also in BIOS>Wireless> and turn WWAN OFF, and enable just WLAN and Bluetooth, the freeze/lag is gone, and WiFI and Bluetooth work fine. Hope this helps you.