Thank you for contacting the Intel community.
If you have the latest driver, have you tried rolling back to a previous version to see if it gets any better? Or you can try uninstalling the driver reinstalling it. You can download the latest version here:
Intel® Wireless Technology-Based Driver for Windows® 10 for Intel® NUC Kit NUC6i[x]SY
Check for sources of interference, particularly if using IEEE* 802.11 Wi-Fi adapters working in the 2.4 GHz spectrum. Possible interference sources can include: Cordless phones that operate in the 5 GHz spectrum, microwave ovens, Bluetooth® technology-enabled devices, and other 802.11 Wi-Fi networks.
Also you can configure 802.11n Channel Bonding on Intel® Wireless Adapters
I just installed BIOS 0060, Bluetooth 19.50.1, Wireless 19.50.1 and all other new drivers and most I can get is 10Mbps download, Upload is 40Mbps.
using the laptop I am writing this message on I get 40Mbps easily. it is using AC 8265 Adapter, NUC uses AC 8260.
both are connected to the same 5ghz wireless network.
I ran Wifiinfoview on both the NUC and laptop and the NUC sees only 5 wireless networks, the laptop sees about 15.
5Ghz network is channel 163 and no other 5Ghz routers within range.
EDIT: I just connected to the 2.4Ghz network and getting 40MBps download, so for some reason the 5Ghz band on the NUC has trouble. Wifiinfoview says 60 signal quality for 5Ghz network.
I’m sorry that this issue still persists with your Intel® NUC, in this case, make sure the channel your access point or wireless router is using is not overlapping or is in use by another nearby access point.
- Software tools such as MetaGeek inSSIDer* help you select the best channel for your access point or wireless router.
- If using 2.4 GHz band, use only channels 1, 6, or 11.
- If using the 5 GHz band, use channels 36, 40, 44, or 48.
Note: We recommend using channel bonding in the 5 GHz band due to the limited number of non-overlapping channels available in the 2.4 GHz band.
I hope this can help.