Follow these steps:
Open Command Prompt as administrator
ping google.com -f -l 1492
If this comes back as fragmented, decrease the number and retry until it isn’t
Keep track of the highest number that isn’t fragmented
netsh int ipv4 set subinterface “Ethernet” mtu=1500 store=persistent
netsh int ipv4 set subinterface “Wi-Fi” mtu=1500 store=persistent
netsh interface ipv4 show subinterfaces
If all the numbers except the top on the left are 1500, you did it!
