We understand you have some connectivity issues where the speed test starts getting high speeds, but then goes significantly slower. The behavior you describe can be caused by different reasons, even by factors external to the adapter. Here are a few items for your consideration:
- Check with the ISP if there is any limitation in the connection, or configuration in the access point that may be causing this.
- Try using a different network and check if the behavior happens as well.
For additional assistance we would like to get the following information:
- Download Intel® System Support Utility, run the tool and use it to create a report with all sections, on the next screen, Save the report to a file. Then use the Advanced editor options to add the resulting XML file to your post as an attachment.
- Was this working fine before?
- Do you get any connectivity issues in other tasks, like downloads, browsing, streaming, etc? or does it happen only when you test the speed?
I updated the Driver to 220.127.116.11 but the download speed still decreases rapidly.
I do not think the network is the problem because when i boot ubuntu on the same notebook connecting to the same network the download speed does not decrease.
So i assume it's a problem of windows 10 (1607) or a driver problem.
These issues affect all networking tasks, sometimes websites take forever to load.
The download speed started at about 60MBits and decreases rapidly:
By your description there may be a Windows* feature, or automatic updates, consuming the bandwidth; or it may be a 3rd party software causing the problem. You might want to check with support for your Computer Manufacturer Support, or for the OS.
Here are some of the common tasks you can disable:
- Disable location services in Windows® 10:
- Disable WiFi Sense:
- Disable P2P updates in Windows*:
Also, you can disable the Bluetooth* component in your computer and check if the connection improves. This is normally done with a switch in the PC chassis, or with a key combination.
For additional recommendations please provide the information we requested before (SSU log, use a different network, issue history).
I have the same problem.
Fritzbox 7490 with FRITZ!OS 06.80 - Firmware updated two weeks ago
Since two days I own a HP Elitebook Folio 1040 G3 with Intel AC 8260.
Exactly the same behaviour. Updated to the newest available wifi driver 18.104.22.168
Ubuntu full VDSL Speed
Win 10 Pro - after short time of full speed downloads slows down. Uploads are not as much affected.
I think it's a Win10 (1607) problem.
Today I tested with my corporate notebook (Lenovo x1 carbon yoga) with the same Wifi card and Intel Drivers 19.10.xx
The speedtest started at 60MBit/s and stays at about 60MBit/s. The Lenovo is running Win 10 Enterprise (1511).
Checking the SSU logs, I noticed that the PC's did not show the channel and type of Wi-Fi connection, also the signal power was rather low in both cases, however, they both appear to be connected to the network.
From the side of the adapter, we would recommend a clean installation of the "driver only", this would discard any issues with the driver caused by recent updates:
1. Download Intel® PROSet/Wireless Software and Drivers for IT Admins, 19.30.0.
Windows 10 64-bit: Wireless_19.30.0_Driver64_Win10.zip
2. Extract the contents of the zip file to a known location in your hard drive.
3. Go to Control Panel, Programs and Features and Uninstall "Intel® PROSet/Wireless Software". When prompted, choose the option to "Discard settings".
4. In Control Panel, Device Manager, Network Adapters, right click on the Intel® Dual Band Wireless-AC 8260 and Uninstall it. Make sure you mark the option to "Delete the driver software for this device".
5. Reboot the PC or scan for hardware changes, check device manager and if an older wireless driver is detected and installed, repeat the actions to uninstall and delete it as well. Repeat this process until the OS does not allow deleting the driver, or until the controller shows as Unknown Device.
6. Remove temporary files: Press the Windows Key + R to open the run box. Type Cleanmgr.exe. Press OK. Select the main drive, usually C:\. Check Temporary Files and uncheck everything else. Press OK.
7. Go to Device Manager and locate the 8260 (it may be an unknown device), select the option to install the driver and browse to the location where you extracted the driver files.
Also, make sure that the Access point is set to work at 5 GHz and 802.11ac (use a dedicated SSID), to take full advantage of the 8260 capabilities.
I uninstalled the PROSet/Wireless Software and reinstalled the Driver according to your instructions.
The download speed still drops down rapidly.
The access point is ok, my mobile Nexus 5x connects with 5Ghz and has a constant download speed of 67MBits.
Here's the output of the SSU after reinstallion of the driver
latitude5470-2.xml.zip 6.1 K
The information in the new report is similar to one from the previous log, the configuration is normal, the adapter shows operational, however, the details such as Wireless channel and connection type are not displayed, the signal strength shows 89%.
The behavior may be caused by factors external not necessarily the Wireless adapter (OS, ISP, access point), here are a few items for your consideration:
- Was this working fine before?
- Were there any changes made to the environment at the time the issue started? if there were, you can try to undo them (uninstall updates, software) and check if the issue solved.
- Run the Windows* Network Troubleshooter and networking commands.
- Disable firewall and Anti-virus and check if it helps.
You can find more information about this in the following advisory from Microsoft*: Fix network connection issues in Windows 10
* Note: This link is being offered for your convenience and should not be viewed as an endorsement by Intel of the content, products, or services offered there.
We are glad to know that your wireless adapter is working fine and the issue has been resolved. At this point, you can check with the ISP or AP manufacturer for further assistance.
Feel free to let us know in case you have any other questions.