Hi, I recently bought a fairly cheap pair of wireless earphones from amazon due to the great reviews (ENACFIRE Future) with Bluetooth 5.0. I bought them mainly for connecting to my PC when I don't really feel like wearing headphones. They're great except for one problem: the audio lag on PC is terrible. It has to be at least 500-600ms. My motherboard (Gigabyte X399 DESIGNARE EX) has built-in Bluetooth 4.2 which is what I've been using. When I try connecting the earphones to my iPhone 6 which has Bluetooth 4.0 the audio lag is negligible so it must be something to do with the connection to the PC.
The PC is less than a metre away from the earphones so range is not the issue.
Please could I get some help on rectifying this issue.