This is really an FYI for folks who are using Deco QoS.

I've done quite a bit of diagnostic testing.  My ISP was just out yesterday and did cable modem bandwidth testing. It was consistently at 690 download and 31 upload speed.  Then I hooked up my new Deco AXE5300 from Costco.

I set my QoS settings to upload of 31 and download to 690.

When I ran speed tests without QoS, I pretty much got the same as the modem tests...690 download and about 30 upload.

When I turned on QoS, I was getting around 520 download consistently.  Hum...

Then I adjusted my QoS download all the way up to 840 (incrementally over several tests) and my speed tests were finally showing around 690 once again...going through the Deco mesh router.

In summary, when Deco asks you to enter your maximum QoS download speed (or upload), you should know what your speeds REALLY are without using the Deco router (i.e. pure modem speeds) and then incrementally adjust your settings in Deco QoS until your speed tests reach the modem speeds, or basically max out.