I can't conveniently post the images here however but on my desktop I cap out at about 950MBPS which is what I would expect with all the overheads.

On my surface was about 170, I used TCP optimer and it went up to about 260MPBS. This was with a USB dongle.

I switched back to Wi-FI and got about 300 mbps.

I monitored task manager throughout to check for any application hogging resources (I too also use MalwareBytes because it's awesome) and couldn't see any issues.

Looks like the symptoms are the same for me I just didn't notice.

It is interesting to note that when I put the suface back on it's charger it hit 500mbps.

Would seem like that suggests it is a power related issue or at least about windows reducing power consumption via link state power management... I was able to replicate it again and again by pulling the charger out and placing it back in.

Dave

Edited by deviousiphone (Mon 26-Apr-21 20:53:58)

Tx Dave. I do not want to wipe the system yet, I an waitinf in Bitdefender, Malwarebytes and Microsoft

In reply to a post by deviousiphone:

Would seem like that suggests it is a power related issue or at least about windows reducing power consumption via link state power management... I was able to replicate it again and again by pulling the charger out and placing it back in.

Dave

OP reckons he’s seeing the same issue with his other machines. See quote from post above...

In reply to a post by JMaples:

Tx. I understand what you mean. I was a user of the earliest laptops in my work and am no stranger to complete reinstalls. But I do not think we are there yet. I have two entirely different modern and fast W10 PCs which have the same problem. Both are kept fully up to date with all program updates. Zen are of the view that the problem lies in the current W10 build. So reinstalling it will not solve the problem.

So what is the common thread...

I can see where you going with this Pheasant, I am inclined to agree, the only difference is the same is true with my desktop yet it has no problems. (I will say again after I used tcp optimizer as I have used it for years).

I would say the noticable difference is laptops based on battery power.... My desktop is not affected but there is no battery management. The surface hits full speed 500mbps (which with it's AC card would be about max) on it's charger.

Has the OP been testing with the surface book both on and off charge? I think with unbuntu performing well it does highlight windows as the issue. I did notice you have the TAP driver installed which gives me reason to believe you use a VPN. You are not connected to the VPN while your doing these tests are you? I happen to know windows isn't great at vpn connections over unix / linux based systems due to poor drivers.

Just wanted to rule that out.

Dave

Edited by deviousiphone (Mon 26-Apr-21 21:24:58)

In reply to a post by deviousiphone:

On my surface was about 170, I used TCP optimer and it went up to about 260MPBS. This was with a USB dongle.

My work issued my Lenovo laptop with a USB adaptor. I wonder if yours is USB2 as those seem quite slow. I’ve seen 500 Mbps over a USB 3 adaptor, but CPU load was quite high. Luckily the Lenovo had its own proprietary port and an Ethernet adaptor for that was £30, so my management provided, and it gives the full 900+ Mbps that I’d expect from an Intel NIC. I would hope the same from the Surface port.

You may be thinking of Windows RT the ARM version of Win8 that MS eventually wrote off for nearly $1bn. I thought that was the Surface without “Pro”. The new Surface Laptops are not related, and the Surface Book that our OP has is the removable screen to tablet concept. A friend of mine has one, he’s happy enough with WiFi that he’s never bought the dock for Ethernet, otherwise I’d ask him to test.

Just to make sure I'm not going slowly insane, I jumped off my Macbook and ran a quick speedtest on a Lenovo X390 Yoga laptop - running all the latest W10 updates and Lenovo firmware updates.

Result:
https://www.speedtest.net/my-result/d/43eaa21c-b239-...

There has never been any tcp optimiser installed on this machine. That's tested via a wired Thunderbolt 3 dock to a 10GbE copper connection; netsh interface tcp show global, gives:

TCP Global Parameters
----------------------------------------------
Receive-Side Scaling State : enabled
Receive Window Auto-Tuning Level : normal
Add-On Congestion Control Provider : default
ECN Capability : disabled
RFC 1323 Timestamps : disabled
Initial RTO : 1000
Receive Segment Coalescing State : enabled
Non Sack Rtt Resiliency : disabled
Max SYN Retransmissions : 4
Fast Open : enabled
Fast Open Fallback : enabled
HyStart : enabled
Proportional Rate Reduction : enabled
Pacing Profile : off

Laptop is running
- Feature update to Windows 10, version 20H2
- April 13, 2021—KB5001330 (OS Builds 19041.928 and 19042.928) aka 2021-04 Cumulative Update for W10 Version 20H2

You don't seem to understand technology.

Could you tell me what the mains/battery readings you get for your CPU Utilisation(%) and Speed (GHz)? You can do this from Task Manager/Performance/CPU

Also intrested what are main/battery setting are in Power Options/Advanced Settings/Processor Power Management/(Minimum/Maximum) Processor State % are?

On the surface series those settings are hidden by default. I have enabled them again with a registry tweak in the past but I don't have time at the moment.

I really don't understand why you are here. The only messages I have seen come off you are usually borderline insulting unless they just plain are.

People asking questions here often are learning about the issues they face for the first time.

Stop wasting time with pointless comments and give them the chance to understand the answer to their question.