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Did you try delete all devices from your wi-fi and use only one device?
Another option could be changing IP address of your device in wi-fi advanced options. Go to settings - wi-fi - on - pick wi-fi - advanced options - IPv4 settings - static - and change IP etc. Then when you come back to wi-fi and choose wi-fi you will see "speed"
If you have your wi-fi already set you need choose wi-fi and press modify and follow instruction
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