Q. I’m running Lenovo x1 carbon 3rd gen with all newly installed drivers and updates. 

After installing Creators Update (Microsoft Windows [Version 10.0.15063]) I have extremely slow wifi. I have installed 19.50.1.5 ver of the driver for Intel 7265

So I check that I’m using the latest intel driver (from March 2017), ran netsh Winsock reset, trying to reinstall drivers and wireless software, trying to do a network reset – all with no result.

Also, I have to try to turn off firewall and antivirus software, and the same no result.

I have a stable connection, good ping response, but pages in all the browsers are opening extra slow. 

So I do some test in the same network with other laptop without CU installed – and im pretty sure that is no internet problems in my place. 

Could you please help with any suggestion? 

Answer.

Microsoft has recently announced a fix for this particular “RSC” (Receive Segment Coalescing) issue, with OS Build 15063.447

Try installing the latest Windows 10 cumulative update (KB4022716, OS Build 15063.447) to see if it helps. To install the update, go to Start >Settings > Update & security > Windows Update >Check for updates. To confirm OS Build, go to Start > Settings >System > About. More information on the update is in the Windows 10 update history page here.

Having had poor performance with multiple adaptors – with Media Tek and Realtek chips using Humax and Netgear routers, I found that changing the router to a Cisco router restored the performance.

Note that the Intel driver performed well with the Humax router, and also with the Cisco router.

It therefore may be an issue between the “combination” being used