@CD3 

I've got a V1 A20, and this is my QoS page:

Note the Bandwidth above, what does it show for your router? Use the icon on the right of the line to update it to what you have if it isn't.

Also, as I understand it, Standard is basically no QoS, equal rights for all devices and uses on the device.

Here is the HELP for that page:

You can select Device Priority also to give more to the gaming devices so they can have priority, might be better than QoS setting.

@IrvSp 

Thanks for the reply. I started there. The speed test always shows 50% less than tested without it. My son does a speed test on his gaming pc and gets the same as the router test. It used to show 990MB or more. The test to the modem is 1.3-1.4Gb. QOS has become a major frustration. I'm thinking about getting rid of this model, replacing it with my older Archer. Then, researching a Linksys if the new High Priority settings don't consistently satisfy the household. 

CD3 wrote

@IrvSp 

The speed test always shows 50% less than tested without it.

@CD3 

That could be a clue here.

If I read that correctly, if you test @ the modem to a PC directly, it is full speed that the ISP provides (you did say this but I want to be sure)? The Speed test you are talking about is in the router, correct?

CD3 wrote

@IrvSp 

It used to show 990MB or more. The test to the modem is 1.3-1.4Gb.

What was 'before'? I know you said "It was a mistake to leave Linksys/Cisco", and mentioned "Never happened with my 3150 N router which did not have QOS". I can't find any like that?

CD3 wrote

@IrvSp 

I'm thinking about getting rid of this model, replacing it with my older Archer.

Worth a try, what model is that? Also, what about the Linksys/Cisco, still have that?

When testing do NOT change cables. Possible the cable from modem to router is the problem here.

@IrvSp 

My previous Archer was the 3150, no QOS. PC speed test was near 1Gb bandwidth. With thr 4000, it's always half, whether from PC or within router itself. It bothers the heck at of me. For now,  QoS is at max everything and we're monitoring performance. 

CD3 wrote

@IrvSp 

My previous Archer was the 3150, no QOS.

@CD3 

Well, the 3150 DOES have QoS. You ever use Tether to access it? That is the only way to reach Home Care it seems. See https://www.tp-link.com/us/support/faq/1772/ and it applies to these router models, " Archer C2300( V1 V2 ) , Archer C5400( V2 ) , Archer C3150 V2 , Archer C4000( V2 V3 ) , Archer C3150( V2) , Archer A20( V3 ) , Archer C2700( V1 ) , Archer C5400X( V1 ) "

CD3 wrote

@IrvSp 

PC speed test was near 1Gb bandwidth. With thr 4000, it's always half, whether from PC or within router itself.

If the router test only shows 1/2 speed, don't expect any device to do better. I might be the cable coming into the router from the modem. Have you tried another one?

CD3 wrote

@IrvSp 

 

For now,  QoS is at max everything and we're monitoring performance. 

Don't use that, go back to STANDARD, no QoS that way, well, no extra boost to any app or device. Be sure to reboot the router after making the change.

EDIT:

Also check the WAN port, make sure no bent pins, could also slow you down.

Last resort, contact Support I guess?

@CD3 

Did you change Device Priority under QoS? It is KNOWN to cap speeds.

See this link, https://www.reddit.com/r/HomeNetworking/comments/dflf0z/tplink_archer_c3150_v2_device_priority_caps_speed/

@CD3  Leave QOS set to standard but manually up the bandwidth speeds. I have mine for both download and upload set to 1999, everything is fast.

@J-A-W 

Many thanks for the advice! I'll configure it.