I have been on the forums for a while trying to get a solution to my stupid AC7265 connecting at the speed of molasses. The tech support is not helpful at all, the driver updates did nothing, but I am pleased to say I finally found solution!
The solution unfortunately costs $17.
Step 1) Go to ebay.com
Step 2) search for BCM43162
Step 3) the Lenovo E455 laptop has the same chip in case you need a driver
The best speed I ever got from my Intel AC chip was 25mbps, now I'm getting my full rated speed!!
This is the solution for the M.2 (NGFF) adapter. If you have a mini pcie you can find an "azurewave" chip on amazon or ebay.