Download speed varies by OS on same computer

[Derekc23]

I have a 900 mbps internet plan via Vodafone. I have three operating systems on different ssds. I have a cat6 cable connected to the router, and the Network adapter is an Intel Killer E2500 Gigabit Ethernet Controller.

My main os, Windows 11, is showing around 500 on Okla speedtest.

I have a second Windows 11 on another disk for test purposes, this is showing around 900. My third os, an old Windows 10, is also showing around 900.

I have tried to compare the specs of the different systems but can't see any differences that might cause this. The 'slower' system seems to have the most recent driver.

 

[ChrisD.]

This is entirely an OS/driver issue. Roll back the driver to an older version and then see.

 

[Derekc23]

Thanks for reply.
Rollback driver is greyed out in Device Manager. Is there a way round this?

 

[Orcvader]

Thanks for reply.
Rollback driver is greyed out in Device Manager. Is there a way round this?

Look up your motherboard model and go to the manufacturer page, there should be a download section with driver downloads. They sometimes have an older driver still available for download.

 

[bledd]

Killer are notorious for crappy software that limits your speed.

Download latest driver from their site, see if it has an option for driver only.

 

[ChrisD.]

Killer are notorious for crappy software that limits your speed.

Yup, and also disable and gaming nonsense crap with any motherboard software.