When I connect my Bluetooth sound speaker my WiFi slows down. Sometimes it doesn't open anything anymore. I read it's a conflict due to radio frequency but I couldn't find any settings to change it on Windows.
41 Answer
If your WiFi is using the 2.4 MHz band, i.e. variants 802.11b, 802.11g or 802.11n, it is possible that Bluetooth, which uses frequencies of about 2400 to 2484 MHz and WiFi in the 2400 - 2500 MHz region, are interfering with each other. You can check this by changing the channels your router users: consult the manual for the specific router, e.g. Netgear, XFinity etc. There is information on the web for changing the channel, e.g. How-To Geek. Since this is an easy, free, adjustment, it won't hurt to try it.
Another possibility is that Power Options, Advanced settings for the wireless adapters is reducing throughput. Be sure it is set to Maximum Performance, though this might slightly reduce operating time on battery.
However, it is also possible, as @MichaelBay states, that your PC can't handle the throughput from two wireless devices. You could try an external WiFi or Bluetooth USB device to take some load off your PC, or to use the 5 GHz WiFi band, if your router can do so, but if the CPU itself is the limiting factor, these will not help.
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