Mouse is Lagging

Hey, just reporting back. I purchased a $16 wireless mouse with a dongle (RF, not Bluetooth) and it works smoother than it ever has before with ZERO lags. So, either BT technology or the Magic Mouse itself is not comparable.

Thanks for your help :)

Ok that is making more sense to me now, thank you.

Here's what I did and it is helping to problem quite a bit.

In the Apple/System Preferences/Displays I unselected "Default for display" and selected "Scaled". The highest resolution there is 2560 x 1440, which I selected on both monitors. Neither of the displays seemed to changed resolution, but the mouse lag is a lot less frequent, a lot. Like I've only noticed it once, maybe twice in the past couple hours.

Yes, I have the late 2014 Mac Mini. Perhaps I did not describe it properly. It is the one shown in your link of Technical Specifications, the one with 2.6ghz.

Perhaps I should ask if it matters which video outputs I am using? Right now I am using both of the Thunderbolt 2 ports with Display Port Mini to Display Port Cables (https://www.amazon.ca/gp/product/B01J8GUH5O/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1)

Should I be using the HDMI video out put instead?

Your notes say that it support up to two displays at 2560 by 1600. I have two displays at 2560 by 1440.

My mouse is literally only 1-2 feet away from the Mac Mini, there are no other Bluetooth devices in the room (apart from my cell phone occasionally which sits on the opposite side of the desk). There are two USB plugins, 1 set of small speakers and one 4 port USB adapter which is about 10 inches long so that I don't have to plug USB devices into the back when needed.

Ok, so it took me a couple days to find a wired mouse. There is a noticeable difference. The wired mouse works when the wireless one does not. I have tried to get rid of everything else with a bluetooth connection, including the keyboard, but to no avail. I have tried new batteries, cleaning the sensors not he underside of the mouse, and reinstalling the mouse. Nothing works :(

I would rather not go with a wired mouse in the long run.

I've ordered this mouse with RF connection and will try it. (https://www.amazon.ca/gp/product/B07221FLYR/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1)

Any other suggestions in the mean time?

Boo. I think I spoke too soon. The problem persists :(

I disconnected all the USB items and still got the lag.