Windows 10 throttling speed

[exoo]

I should be getting gigabit speeds, when I test with speedtest I get around ~140mbps, fast.com shows 300ish, sometimes 400.

My NIC is set to 1.0 gbps, my network card is not the issue.

I tried a new windows installation on a spare SSD drive, the speeds were instantly 1gbps without problems. This is an issue with something in my windows.

I don't want a new windows installation unless it's 100% needed.

If you need any other info, let me know.

I feel that this is 100% a problem within my windows installation.
I feel like it's throttling, as the tests are very stable and feel like they don't want to go over a certain speed.

 

 

**Solved this issue.

I used the SG TCP Optimizer long ago (when my speeds were 150/15), I reset to default windows settings and now my speed tests immediately hit 900.**

Edited January 9, 2020 by exoo

[Jarsky]

2 minutes ago, exoo said:

I should be getting gigabit speeds, when I test with speedtest I get around ~140mbps, fast.com shows 300ish, sometimes 400.

My NIC is set to 1.0 gbps, my network card is not the issue.

I tried a new windows installation on a spare SSD drive, the speeds were instantly 1gbps without problems. This is an issue with something in my windows.

I don't want a new windows installation unless it's 100% needed.

If you need any other info, let me know.

I feel that this is 100% a problem within my windows installation.
I feel like it's throttling, as the tests are very stable and feel like they don't want to go over a certain speed.

Speedtests to external speedtest servers will only show as fast as the weakest link in your network, which is probably your internet speed. 

If you want to test if your ethernet is working at its full speed, you need to test a file transfer or an iperf3 or something to another computer on your network. 

[Samfisher]

5 minutes ago, Jarsky said:

Speedtests to external speedtest servers will only show as fast as the weakest link in your network, which is probably your internet speed. 

If you want to test if your ethernet is working at its full speed, you need to test a file transfer or an iperf3 or something to another computer on your network. 

He's talking about internet speed tho lol

[Jarsky]

2 minutes ago, Samfisher said:

He's talking about internet speed tho lol

Thats a big assumption? He hasn't even said what his internet connection is...

[Samfisher]

1 minute ago, Jarsky said:

Thats a big assumption? He hasn't even said what his internet connection is...

Old installation up to 400Mbps, new Windows gigabit... He's comparing speedtest results.

[Jarsky]

Just now, Samfisher said:

Old installation up to 400Mbps, new Windows gigabit... He's comparing speedtest results.

Yes, and problem is if anyone else is using the connection, if he has torrents running, etc...especially if he only has something like 20Mbit upload thats getting saturated then its going to seriously skew the results.

[Samfisher]

3 minutes ago, Jarsky said:

Yes, and problem is if anyone else is using the connection, if he has torrents running, etc...especially if he only has something like 20Mbit upload thats getting saturated then its going to seriously skew the results.

That's still nothing to do with physical layer speeds tho... It's still the internet.  Not whether the port is signalling at 1Gbit or not.  And he did mention the tests were very stable, which means it doesn't fluctuate, its a constant issue.

[exoo]

Yes, this is internet speeds. My internet is fiber 1000/35.
Other PCs on my network get 900-1.0gbps speed without issues. My new windows install got 1.0gbps no issues.

This is a problem within my PC.

I ran safemode with networking, turned off all non-windows services, and startup programs and the result was the same.
I also tried a new user, still the same result.

I installed new network drivers, old network drivers, from my motherboards (asus) website, from intel's website, nothing fixed the issue.

[Jarsky]

Thank you for clarifying. 

 

Have you tried to reset the TCP/IP stack?

At the command prompt, run the following commands in the listed order, and then check to see if that fixes your connection problem:

Type netsh winsock reset and press Enter.
Type netsh int ip reset and press Enter.
Type ipconfig /release and press Enter.
Type ipconfig /renew and press Enter.
Type ipconfig /flushdns and press Enter.

 

Also check that autotuning is set to normal. You can run this command

netsh int tcp set global autotuninglevel=normal

 

[exoo]

Solved this issue.

I used the SG TCP Optimizer long ago (when my speeds were 150/15), I reset to default windows settings and now my speed tests immediately hit 900.

 

The setting responsible was your last command.

 

"netsh int tcp set global autotuninglevel=normal"

 

If I set this to disabled (as it was) it throttles my speeds, when it's normal, all is working correctly.