I've found that using a short usb extension cable with those wireless dongles, rather than plugging them directly into the computer, works loads better and fixed "lag" issues for me. Maybe some kind of EMF interference?
It seems most-useful to make sure it is only a USB 2 cable, without the extra USB 3 data lines.
(USB 3 makes a ton of noise at ~2.4GHz. They could have spread out emissions and dialed them down, but they stuck them in the same trash band that microwave ovens [and mouse dongles] use because... well, it's cheaper and easier that way.]
USB3's high speed produces EM inference with some receivers.