Spotty AX82U V1 Wifi 5Ghz performance

[Jaja]

So I've been using the Ax82U v1 for the past 3 years, it has been good until I've been messing with some features. I believe the most notable one is the OpenVPN server from what I've read on other posts. Also its running an AiMesh setup, wired backhaul for that great node stability. The 5G band has been having somewhat of some stability issues, where the upload link speed drops to 6mbps, while download might be at 150mbps, but that makes Instagram to take way too long to load or Youtube to sometimes buffer the video or straight out go to 240p, something that should not be expected of a 250/250 mbps ISP connection.

Setup:
AX82U v1 as Main AiMesh Router (running on AsusWRT - 3.0.0.4.388_25004-g47a0457)
2x RP AC55s as AiMesh Nodes (running on AsusWRT - 3.0.0.4.384_83394-g96badd4)

Avg Clients at a time ~40, around 25 of them hooked to the Ax82U through WiFi
Services running:
OpenVPN server
DDNS
Activated Dual WAN (5G has had issues since before activating)

Cpu Cores 1 and 2 averaging 45% usage, core 3 low cpu usage
Memory used 65%, 335 MB / 512 MB

I have configured a twice a week programmed reboot, also added an external pc 120mm fan to aide in cooling in case its thermal throttling.

Any suggestions would be greatly appreciated, I've been thinking on disabling 160MHz, but 5G seems to not be that congested when running WiFi Analyzer, I've tested runing MCS 9 and MCS 11 but really not a difference on the long term. Also read that maybe the BCM6750 is not as beefy as it should be for the AX5400 setup, being a somewhat basic soc, and maybe I should jump wagon to another Router that might be beefier on that regard, like an ROG Rapture AX6000 or the TUF-AX4200 but quite unsure of the MediaTek soc performance on the latter. Another final idea, is running the openvpn server instead on an old laptop I have, but have had no success on setting it up, maybe some tweaks missing?

Got the following settings on 5ghz:

 

[bbunge]

Go back to Dual Band SnartConnect. 5 GHz at 80 MHz on a fixed non DFS channels. 2.4 GHz at 20 MHz on channel 1, 6 or 11 (or 13 if available). Disable auto reboot as there usually is no real reason to do it.

Many do not like the idea of not using 160 MHz. But, you will have better range and no interruptions from RADAR detection.

Try it. You'll like it!

Oh, don't mess with the Professional Settings!

 

[Tech9]

Go back to Dual Band SnartConnect

Not supported on RT-AC55 extenders.

Got the following settings on 5ghz:

Try this, will work on your router as well:

AX86U Check my settings please

Can anyone chime in on these settings AX86U Merlin 388.1_0

www.snbforums.com

 

[Jaja]

Thanks for the reply guys, I will definitely check the settings out and hope to give you guys a positive update on the week.

 

[Metroguy]

Enable NAT hardware acceleration ( disable QoS)

 

[Tech9]

Enable NAT hardware acceleration ( disable QoS)

@Metroguy, your random suggestions are completely unrelated to the described issue.

 

[Squall Leonhart]

and disable airtime fairness / set ofdma to ul only.

 

[Metroguy]

@Metroguy, your random suggestions are completely unrelated to the described issue.

It's not random suggestion. I disabled it on my just a week old tuf ax6000 and so far snappier performance

 

[Tech9]

Your router is nothing even close to RT-AX82U. It has different SoC, different radios and runs different firmware, just the GUI looks the same.

 

[Metroguy]

Your router is nothing even close to RT-AX82U. It has different SoC, different radios and runs different firmware, just the GUI looks the same.

So you mean to say that it's not good

 

[Tech9]

You tell is how good it is. Not one of the popular models around, no much experience with it. I wanted to say whatever fixed your issue on this completely different hardware router doesn't automatically apply to all Asus routers. RT-AX82U doesn't have NAT acceleration setting in GUI and some of the QoS options available on it don't disable entirely NAT acceleration. What is available on your router and how it works under the hood is different.

 

[Jaja]

So did some changes on the settings as part of Tech9's answer, disabling 160mhz and it has been working way better. Thanks for the replies!