Originally Posted by metalspring
Hmm, I'm not so sure that would be the issue
The current wifi module (driver) should, without other interference, give you the SAME wifi performance it always has, no matter what android version
as far as i know, all modules are contained within the zImage of kernels which are fairly compatible over android versions, its the ramdisk that changes
4.3 kernels that use your rom's built in ramdisk (any kernel type) are relatively easy to port back to 4.2.2 and vice versa, but kernels that use a full boot.img are very very incompatible over different major android versions (usually you never get past the boot logo or at least get stuck in a constant boot loop)
The only issue i could really see with older wifi drivers would be some incompatibility with something in the OS, which would be more of a google issue (they DID push 4.3.x to the gnex and should have either updated the kernel or made 4.3.x more compatible with the older wifi module)
again this is simply educated guesswork here, and i could be entirely wrong lol
Its not the performance thats the issue. Its the fact that it randomly stops autoscanning. I think the newer 4.3.1 kernels and some kernels that pulled the updated wifi drivers fix the issue though.
Edit: never mind, this is still borked even on the 4.3.1 stock kernel.
Current: Galaxy Nexus LTE - CM10.1 Nightly (jellybro)
Extra (previous): Droid Incredible AMOLED - CM7.2
Father: HTC Rezound - Stock Rooted