I have an Apple Mac connected wirelessly to my Sky router and easily get from 10mbs upwards. I have just purchased a custom built Windows 10 based PC and it sits next to it. The PC has a older dongle fitted that I had already (TPLINK AC600). Sometimes I get 10mbs but more often less than 1. I can run speed tests on both simultaneously and get totally different results, with the PC being poor. I have tried the PC when the Mac is switched off and it makes no difference. Before I buy another dongle, does anyone have any ideas? I can’t use a cable as router is across the hall in a different room.