Mac Studio WIFI/Internet issues

Restart the Mesh system.

Use a Cat6 or better ethernet cable.

On the Wi-fi side test both the 2.4GHz and 5GHz bands.

Disable and uninstall any third party protecting or cleaning software and VPN if you are using one.

10Gb Ethernet:

"energy efficient" drops power to the 10Gb Ethernet chip to save energy. It is NOT compatible with Top Speeds, and could cause issues with auto-speed. In the hardware pane, set Manual, then under Duplex, set: “Full-Duplex, Flow Control” NOT “Full-Duplex, Flow Control, power efficient” to disable power saving and boost top speed.

The Mac Studio has a 10Gb Ethernet port. This 10G Ethernet port is NOT compatible with speeds slower than ONE-Gigabit Ethernet. It is also NOT compatible with cables that have fewer than all four pairs available for data.

If you have some fancy equipment at the other end of the cable, it is possible it is trying to make a 10Gb connection. A 10Gb (or 5Gb or 2.5Gb) connection is only stable when cables are excellent and fairly short (like Category-6 rated cables under 100 feet). If either of those are not true, or you have you added patch cables that are not Category-6 rated, you could be seeing it connect at a faster-than-Gigabit speed, then error out and disconnect.

The setting [√] ABV/AEV mode selected on the hardware pane of advanced Wi-Fi Ethernet OR in your Router may constrain the connection in unexpected ways that could limit overall performance. The feature is used ONLY for prioritizing “live” camera video streams over Ethernet”.

Actual Speed:

The good way to check the actual connection speed USED to be Network Utility, But in Catalina and later, Apple has deprecated Network Utility and now you have to use a Terminal command to see your actual connection speed. First, you need to know what en number the link is. then you use a command like this one, substituting the actual en number.

my main Ethernet connection uses BSD name en2 (as shown in) :

 menu > about this Mac > (system report) > network:

Aquantia AQC107-B0:

Name: ethernet

Type: Ethernet Controller

Bus: PCI

Slot: Slot-3

Vendor ID: 0x1d6a

Device ID: 0x87b1

Subsystem Vendor ID: 0x1d6a

Subsystem ID: 0x0001

Revision ID: 0x0002

Link Width: x4

BSD name: en2

Kext name: AppleEthernetAquantiaAqtion.kext

Location: /System/Library/Extensions/IONetworkingFamily.kext/Contents/PlugIns/AppleEthernetAquantiaAqtion.kext

Version: 1.0.64

Terminal command:

ifconfig en2 | grep media

with this as my output for 10 Gigabit Ethernet:

media: 10Gbase-T <full-duplex,flow-control>

For ‘regular’ Gigabit Ethernet, you should get this instead:

media: 1000baseT <full-duplex,flow-control>

Errors detected:

To see if an Ethernet link is throwing more than a handful of initial errors, you can use Terminal command:

netstat -I en2

This is the resulting output. Counters are In-packets, In-errors, Out-packets, Out-Errors, Collisions. There should never be more than handful of errors from starting up, and in most cases, NONE.

Name       Mtu   Network       Address            Ipkts Ierrs    Opkts Oerrs  Coll

en2   8163  <Link#4>    00:01:d2:1a:00:dd   696697     0   484301     0     0

en2   8163  grantsmacpr fe80:4::461:ea0d:   696697     -   484301     -     -

en2   8163  192.168.0/23  192.168.0.204     696697     -   484301     -     -

Reading the top line, If the link were running beyond its ability to run and be stable, for example it auto-speeded to 10Gb but the cabling could only reliably support 2.5Gb, we would see non-zero errors counts, and errors increasing over time. (and possibly, disconnecting)

The people who are answering your questions here are NOT Apple employees. They are other users, who Volunteer their time and energy to help you in whatever way they can.

Sometimes you might get information that is tangential to you wanted to know, or WAY more information than you wanted.

PLEASE  try to be gracious in your responses. If you got more than you wanted to hear, Please do not assault the person who gave you tangential or ‘too much' information.  Instead, understand that they were TRYING to be helpful, even if their answer did not line up perfectly with your query. 

Just ignore the overage and get on with solving your problems, and count your blessings that someone was willing to help, even if the answer was "too much" or “way off base”.  

If important parts of your question did not get answered, just ask a more pointed question and Readers will try again.

Sounds like you are using both Wi-Fi and a cabled Ethernet connection..?

If so, then move the Ethernet connection to the top of the Network Service Order.

System Settings > Network > click the・・・⋁ button > drag Ethernet to the top > click OK.

<< testing both ... ethernet strength... >>

Exactly how did you do that?

What does disconnecting it tell you, expect that is no longer doing anything at all?

Were you running a speed test or some other test at the time?

I am not following your testing procedure at all.