Slow download speed vs high upload... Windows11


D

D3LL

Member
Local time
10:24 AM
Posts
15
OS
Windows 11 Pro
Hi all,

So having some really weird issues with Windows 11. I've recently upgraded to 910mbps with my broadband.
Running a speed tests on 2 different Windows 11 machines (hardwired) I'm getting 300-400mbps down and 900mbps up.

Testing with my MacBookPro on the same ethernet cable and port I get 910down and 920up (which is what I expect so it's not an ISP issue).

The 2 Windows 11 Machines I am testing on are an Intel NUC and Dell Pro Premium.
I have rebooted, updates drivers + windows, checked the power settings and turned off any power saving features on the adapters but still can't seem to achieve the full download speed.

I've also tried other sites for testing such as speedtest.net, NPURF and fast.com

I'm at a loss any ideas?
 
Windows Build/Version
Version 25H2 (OS Build 26200.7922)

My Computer

System One

  • OS
    Windows 11 Pro
    Computer type
    Laptop
    Manufacturer/Model
    Dell 14 Pro Premium
    CPU
    Intel Core Ultra 5
    Motherboard
    Dell
    Memory
    16GB
    Graphics Card(s)
    Intel Arc 8GB
    Sound Card
    N/A
    Monitor(s) Displays
    N/A
    Screen Resolution
    N/A
    Hard Drives
    NVME

My Computer

System One

  • OS
    Home26H2Can
    Computer type
    PC/Desktop
    CPU
    AMD Ryzen 5 8600G (07/24)
    Motherboard
    ASROCK B650M-HDV/M.2 (07/24) BIOS 4.21 AGESA ComboAM5 1.3.0.1 (04/26)
    Memory
    2x32GB Kingston FURY DDR5 5600 MHz CL36 @5200 CL36 (07/24)
    Graphics Card(s)
    ASROCK Radeon RX 6600 Challenger D 8G @48FPS (08/24)
    Sound Card
    Creative Sound BlasterX AE-5 Plus (05/24)
    Monitor(s) Displays
    24" Philips 24M1N3200ZS/00 (05/24)
    Screen Resolution
    1920×1080@165Hz via DP1.4
    Hard Drives
    Kingston KC3000 NVMe 2TB (05/24)
    ADATA XPG GAMMIX S11 Pro 512GB (07/19)
    PSU
    Seasonic Core GM 550 Gold (04/24)
    Case
    Fractal Design Define 7 Mini with 3x Noctua NF-P14s/12@555rpm (04/24)
    Cooling
    Noctua NH-U12S with Noctua NF-P12 (04/24)
    Keyboard
    HP Pavilion Wired Keyboard 300 (07/24) + Rabalux 76017 Parker (01/24)
    Mouse
    Logitech M330 Silent Plus (01/26)
    Internet Speed
    500/100 Mbps via RouterOS (05/21) & TCP Optimizer
    Browser
    Edge, Brave for YouTube, LibreWolf for FB
    Antivirus
    NextDNS blocking 1/3 Traffic
    Other Info
    Phone: Motorola Moto G86 (02/26)
    Backup: Hasleo Backup Suite (PreOS)
    Headphones: Sennheiser RS170 (09/10)
    Chair: Huzaro Force 4.4 Grey Mesh (05/24)
    Notifier: Xiaomi Mi Band 9 Milanese (10/24)
    FlexCore USB-C 3.2 Gen 1 (M) to LAN (F) (08/25)
Looking at that device specs it appears it does not have a built in ethernet port but uses either a dock or usb ethernet adapter. Comparing either of thoses connection types to what you get if you are using a lan port built onto your MAC motherboard is not a good test. It is not like for like.
A better test would be to compare speeds using the wireless connection on both devices. If they are similar, the issue is in the ethernet adapter or dock, not Windows.

When you say you updated your drivers did you do so manually or using Dell's update tool. Did you also update your bios. New bios released on 2/16/26 New wifi and usb/dock ethernet drivers released 3/6/26.
If you have Dell Command Update installed on your system, I suggest you use that to keep drivers and bios updated..
 

My Computers

System One System Two

  • OS
    Windows 11 Pro 25H2
    Computer type
    PC/Desktop
    Manufacturer/Model
    Dell Optiplex 7080
    CPU
    i9-10900 10 core 20 threads
    Motherboard
    DELL 0J37VM
    Memory
    32 gb
    Graphics Card(s)
    none-Intel UHD Graphics 630
    Sound Card
    Integrated Realtek
    Monitor(s) Displays
    Benq 27
    Screen Resolution
    2560x1440
    Hard Drives
    2x1tb Solidigm m.2 nvme /External drives 512gb Samsung m.2 sata+2tb Kingston m2.nvme
    PSU
    500w
    Case
    MT
    Cooling
    Dell Premium
    Keyboard
    Logitech wired
    Mouse
    Logitech wireless
    Internet Speed
    so slow I'm too embarrassed to tell
    Browser
    #1 Edge #2 Firefox
    Antivirus
    Defender+MWB Premium
  • Operating System
    Windows 11 Pro 24H2 26200.8457
    Computer type
    PC/Desktop
    Manufacturer/Model
    Beelink Mini PC SER5
    CPU
    AMD Ryzen 7 6800U
    Memory
    32 gb
    Graphics card(s)
    integrated
    Sound Card
    integrated
    Monitor(s) Displays
    Benq 27
    Screen Resolution
    2560x1440
    Hard Drives
    1TB Crucial nvme
    Keyboard
    Logitech wired
    Mouse
    Logitech wireless
    Internet Speed
    still too embarrassed to tell
    Browser
    Firefox
    Antivirus
    Defender
    Other Info
    System 3 is non compliant Dell 9020 i7-4770/24gb ram Win11 PRO 26200.8457
I have the same problem and I'm looking for a solution since a while myself.
 

My Computer

System One

  • OS
    Windows 11 Pro 25H2
    Computer type
    Laptop
    Manufacturer/Model
    HP
    CPU
    Gen 11 Core i5
    Memory
    16GB
TairikuOkami said:
The problem might be Windows default settings and it's network "optimizations".

SpeedGuide.net :: TCP Optimizer / Downloads

www.speedguide.net www.speedguide.net
Click to expand...
Edit - seems I spoke too soon... this worked for the Intel NUC for a short while and now its reverted back to how it was? , the Dell Laptop I only get around 300-500mbps download even after applying the same changes. Using "Optimal" on the tool and change all adapters selected.
 
Last edited:

My Computer

System One

  • OS
    Windows 11 Pro
    Computer type
    Laptop
    Manufacturer/Model
    Dell 14 Pro Premium
    CPU
    Intel Core Ultra 5
    Motherboard
    Dell
    Memory
    16GB
    Graphics Card(s)
    Intel Arc 8GB
    Sound Card
    N/A
    Monitor(s) Displays
    N/A
    Screen Resolution
    N/A
    Hard Drives
    NVME
glasskuter said:
Looking at that device specs it appears it does not have a built in ethernet port but uses either a dock or usb ethernet adapter. Comparing either of thoses connection types to what you get if you are using a lan port built onto your MAC motherboard is not a good test. It is not like for like.
A better test would be to compare speeds using the wireless connection on both devices. If they are similar, the issue is in the ethernet adapter or dock, not Windows.

When you say you updated your drivers did you do so manually or using Dell's update tool. Did you also update your bios. New bios released on 2/16/26 New wifi and usb/dock ethernet drivers released 3/6/26.
If you have Dell Command Update installed on your system, I suggest you use that to keep drivers and bios updated..
Click to expand...
Hence why I tested on 2 windows devices as well and got the same result as each other. I tried both manual and Dell command. The laptop is FULLY up to date both Windows/Hardware/Drivers/Bios etc.
 

My Computer

System One

  • OS
    Windows 11 Pro
    Computer type
    Laptop
    Manufacturer/Model
    Dell 14 Pro Premium
    CPU
    Intel Core Ultra 5
    Motherboard
    Dell
    Memory
    16GB
    Graphics Card(s)
    Intel Arc 8GB
    Sound Card
    N/A
    Monitor(s) Displays
    N/A
    Screen Resolution
    N/A
    Hard Drives
    NVME
D3LL said:
Hence why I tested on 2 windows devices as well and got the same result as each other.
Click to expand...
No matter whether devices are Windows or Mac, the test would be valid only if using the same ethernet adapter. Did you use the usb ethernet adapter on all the devices you tested with?
 

My Computers

System One System Two

  • OS
    Windows 11 Pro 25H2
    Computer type
    PC/Desktop
    Manufacturer/Model
    Dell Optiplex 7080
    CPU
    i9-10900 10 core 20 threads
    Motherboard
    DELL 0J37VM
    Memory
    32 gb
    Graphics Card(s)
    none-Intel UHD Graphics 630
    Sound Card
    Integrated Realtek
    Monitor(s) Displays
    Benq 27
    Screen Resolution
    2560x1440
    Hard Drives
    2x1tb Solidigm m.2 nvme /External drives 512gb Samsung m.2 sata+2tb Kingston m2.nvme
    PSU
    500w
    Case
    MT
    Cooling
    Dell Premium
    Keyboard
    Logitech wired
    Mouse
    Logitech wireless
    Internet Speed
    so slow I'm too embarrassed to tell
    Browser
    #1 Edge #2 Firefox
    Antivirus
    Defender+MWB Premium
  • Operating System
    Windows 11 Pro 24H2 26200.8457
    Computer type
    PC/Desktop
    Manufacturer/Model
    Beelink Mini PC SER5
    CPU
    AMD Ryzen 7 6800U
    Memory
    32 gb
    Graphics card(s)
    integrated
    Sound Card
    integrated
    Monitor(s) Displays
    Benq 27
    Screen Resolution
    2560x1440
    Hard Drives
    1TB Crucial nvme
    Keyboard
    Logitech wired
    Mouse
    Logitech wireless
    Internet Speed
    still too embarrassed to tell
    Browser
    Firefox
    Antivirus
    Defender
    Other Info
    System 3 is non compliant Dell 9020 i7-4770/24gb ram Win11 PRO 26200.8457
glasskuter said:
No matter whether devices are Windows or Mac, the test would be valid only if using the same ethernet adapter. Did you use the usb ethernet adapter on all the devices you tested with?
Click to expand...
Yes I tried both USB A and USBC Ethernet adapters on both and tried the onboard on the Intel NUC as well. Same results.
 

My Computer

System One

  • OS
    Windows 11 Pro
    Computer type
    Laptop
    Manufacturer/Model
    Dell 14 Pro Premium
    CPU
    Intel Core Ultra 5
    Motherboard
    Dell
    Memory
    16GB
    Graphics Card(s)
    Intel Arc 8GB
    Sound Card
    N/A
    Monitor(s) Displays
    N/A
    Screen Resolution
    N/A
    Hard Drives
    NVME
Did you try comparing speeds when connecting using wireless as I suggested?

I am assuming you are also performing these speed tests using the same ethernet cable AND router port. If not, eliminate both the cable and router port being the problem.

Only other things I would know to try is reset network adapters to see if it makes a difference. Do this while connecteed to USB adapter. Reset Network Adapters in Windows 11

Though I can't for the life of me think how it would have anything to do with this paticular issue, you can also reset network components using @FreeBooter attached batch file. Run it as administrator.
 

Attachments

My Computers

System One System Two

  • OS
    Windows 11 Pro 25H2
    Computer type
    PC/Desktop
    Manufacturer/Model
    Dell Optiplex 7080
    CPU
    i9-10900 10 core 20 threads
    Motherboard
    DELL 0J37VM
    Memory
    32 gb
    Graphics Card(s)
    none-Intel UHD Graphics 630
    Sound Card
    Integrated Realtek
    Monitor(s) Displays
    Benq 27
    Screen Resolution
    2560x1440
    Hard Drives
    2x1tb Solidigm m.2 nvme /External drives 512gb Samsung m.2 sata+2tb Kingston m2.nvme
    PSU
    500w
    Case
    MT
    Cooling
    Dell Premium
    Keyboard
    Logitech wired
    Mouse
    Logitech wireless
    Internet Speed
    so slow I'm too embarrassed to tell
    Browser
    #1 Edge #2 Firefox
    Antivirus
    Defender+MWB Premium
  • Operating System
    Windows 11 Pro 24H2 26200.8457
    Computer type
    PC/Desktop
    Manufacturer/Model
    Beelink Mini PC SER5
    CPU
    AMD Ryzen 7 6800U
    Memory
    32 gb
    Graphics card(s)
    integrated
    Sound Card
    integrated
    Monitor(s) Displays
    Benq 27
    Screen Resolution
    2560x1440
    Hard Drives
    1TB Crucial nvme
    Keyboard
    Logitech wired
    Mouse
    Logitech wireless
    Internet Speed
    still too embarrassed to tell
    Browser
    Firefox
    Antivirus
    Defender
    Other Info
    System 3 is non compliant Dell 9020 i7-4770/24gb ram Win11 PRO 26200.8457
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