Why does the mouse on my 21.5-inch iMac with Retina 4K display stutter?

I just recently purchased a new 21.5-inch iMac with Retina 4K display (3.6GHz quad-core 7th-generation Intel Core i7 processor, Turbo Boost up to 4.2GHz). The mouse on this computer stutters and briefly freezes? it doesn't matter what mouse. I've used the Magic Mouse 2 that came with it. I've used older Apple mice and even a wired mouse. Any ideas why a high-end computer would be doing this? it has the latest OS.
ronfastI.T. DirectorAsked:
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David FavorLinux/LXD/WordPress/Hosting SavantCommented:
Hum... My first guess would be a bluetooth problem

And you said problem persists using a wired mouse.

First, stick with the wired mouse till you resolve the problem.

Check the following... I know these are odd + should have no bearing + give them a try.

1) Be sure you plug your wired mouse directly into a port on your iMac (so don't use a USB hub).

2) Try every USB port + see if problem is common to all ports or just one port.

3) Check your surface. Change mouse pads or if you aren't using one, buy a cheap one somewhere.

If problem persists, make an appointment at an Apple store Genius bar or contact Apple to do a return + repair.
How much RAM do you have?

First thing to try with any Mac is to reset the SMC and the PRAM.  These are quick and standard resets that can sometimes fix phantom problems.

Reset the SMC:
Since this is an iMac, turn off the power.
Unplug the power.
Press and hold the power button.
Release after 5 seconds, then power up.

Reset the PRAM:  (You may have to use a wired keyboard or USB dongle keyboard instead of bluetooth to catch the key press at the start.)
Start the system.
Press and hold command option p r
Wait for 3 chimes. (Although, in the new versions of OS X, it may not chime.  You might have to wait for the screen to blink 3 times)

Next thing to try is to boot into Apple hardware Diagnostics:  (You may need a wired keyboard to catch this in time)
Press and hold the the d key when you start up your Mac.  Run the tests. (https://support.apple.com/en-us/HT202731)

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ronfastI.T. DirectorAuthor Commented:
thank you both very much. I'm not a Mac person so will see how this goes
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