After picking up the Lenovo E585 in this ripper of a deal I was a little disappointed with the Wifi Performance when it was a reasonable distance from the router.
I bought a new Wireless Network adapter, the Intel Wireless AC 9260 from uMart for less than $30 delivered
It was a pretty straightforward upgrade (as someone who's only previous experience has been upgrading from a HDD to an SSD) but the Wifi performance upgrade was fantastic. Where it would previously struggle to load 144p youtube (when a long distance from the router with multiple walls between device and router), I now get consistent 720p or better.
Would have loved to have posted this on the deal page, but comments are now expired, so hopefully someone else finds this useful.
If you've got a laptop and the Wifi performance is bad, the solution might be easier than you thought.
While a good piece of advice, I can't imagine the factory Qualcomm AC wifi unit being so bad that it couldn't even play a 144p video on Youtube. Chances are the the unit in your laptop was defective, or the antenna cables weren't connected properly.
Still, good little find and upgrade.