> 
> Is your poorly performing monitor is connected to HDMI?
Yes
> 
> > xrandr
> > Screen 0: minimum 320 x 200, current 3520 x 1200, maximum 8192 x 8192
> > HDMI-1 connected 1920x1080+1600+0 (normal left inverted right x axis y 
> > axis) 609mm x 347mm
> >    1366x768      59.79 +
> >    1920x1080     60.00    50.00    59.94*   30.00    25.00    24.00    
> > 29.97    23.98
> 
> I ask since I see an oddity in the above.  What is the model of the monitor 
> connected?

HDMI-1 connected 1920x1080+1600+0 (normal left inverted right x axis y axis) 
609mm x 347mm
   1366x768      59.79 +
   1920x1080     60.00*   50.00    59.94    30.00    25.00    24.00    29.97    
23.98  

Hence, it is running in 1920x1080

It is a T24E310EW Samsung

> From the xrandr man page....
> 
>      If  invoked  without  any  option, it will dump the state of the outputs,
>      showing the existing modes for each of them, with a '+'  after  the  pre‐
>      ferred modes and a '*' after the current mode.
> 
> So, the monitor seems to be reporting that its native resolution is 1366x768 
> but not
> currently connected at it.
> 
> 
> >   
> >    1920x1080i    60.00    50.00    59.94  
> >    1280x720      60.00    50.00    59.94  
> >    1024x768      75.03    70.07    60.00  
> >    832x624       74.55  
> >    800x600       72.19    75.00    60.32  
> >    720x576       50.00  
> >    720x576i      50.00  
> >    720x480       60.00    59.94  
> >    720x480i      60.00    59.94  
> >    640x480       75.00    72.81    66.67    60.00    59.94  
> >    720x400       70.08  
> > DP-1 connected primary 1600x1200+0+0 (normal left inverted right x axis y 
> > axis) 408mm x 306mm
> >    1600x1200     60.00*+
> >    1280x1024     75.02    60.02  
> >    1280x960      60.00  
> >    1152x864      75.00  
> >    1024x768      75.03    70.07    60.00  
> >    832x624       74.55  
> >    800x600       72.19    75.00    60.32    56.25  
> >    640x480       75.00    72.81    66.67    59.94  
> >    720x400       70.08  
> 
> 
> -- 
> A motto of mine is: When in doubt, try it out
> 
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