What kind of mouse has best performance to use with a Mac? I recently got a Mac upgrade to a new MacBook Air (10.14.6), which only has two new small USB-C connections. I therefore bought a USB-C to old USB adaptor to be able to connect my harddrives, USB sticks and the wireless mouse (working with a USB receiver). 

But now it turns out that the mouse input is lagging a LOT compared to the old Mac (where I could use the USB receiver directly in a USB post). Also the mousepad itself works perfectly normal. 

The lag is not only very disturbing when playing games (such as minecraft), but also with normal operations (finding and clicking on an app, dragging files etc). The lag is clearly a result of the USB C adaptor. 

So how to avoid this problem best? Should I 


buy a new wireless mouse with USB-C receiver 
buy a bluetooth mouse
buy a wired USB-C mouse?


Which is the best option to maximally reduce any lag?
I think you have arrived at the wrong conclusion. A USB-C to USB-A adapter cannot introduce lag on your mouse. It’s only a mechanical adapter from one type of plug to another - there’s nothing changed in the actual electric signal.

I would look at:

1) ensuring your have the correct driver

2) ensure that there are no sources of noise near the wireless adapter (try disabling WiFi, Bluetooth etc on the Mac to see if it is disturbed by those)

3) that the actual wireless antenna for the mouse is placed near the mouse