Hi I might have some updates. I have been reading all the comments but
my issue was totally different. I use an Asus Tuf fx504 laptop and
recently dual booted to Ubuntu 20.04. However I did not install the
nvidia drivers yet. Not this issue of lagging box around cursor happened
randomly one day. I then finally installed the nvidia drivers hoping it
would help. I have tried logging in and out, reconfigured lightdm as
some answers suggested but still the issue persists.

Iam using a dual monitor and currently on nvidia-graphics-driver-440

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  Lagging square around mouse pointer

Status in nvidia-graphics-drivers-375 package in Ubuntu:
Status in nvidia-graphics-drivers-384 package in Ubuntu:
Status in plasma-workspace package in Ubuntu:

Bug description:
  (This can also be an nvidia related problem)

  Mouse pointer behaves as if it has an invisible square attached to it.
  This square covers some area next to the pointer, but it is not always
  clear exactly where (a link to a screenshot is shown below, please
  note the white square with some text from the previous webpage
  displayed in that window).

  This makes selecting text difficult, as one never knows where exactly
  the selection ends. Also, scrolling in some windows becomes
  problematic, as the pointer shadows a part of the scrollbar. When a
  text is being typed, one needs to make sure that the pointer is parked
  sufficiently far from the text (so, to make a long story short, this
  is very annoying).

  This behavior does not depend on the choice of the cursor theme.

  (A link to the screenshot: https://goo.gl/photos/92KKGyFs3AkdxYb79)

  ProblemType: Bug
  DistroRelease: Ubuntu 17.04
  Package: plasma-workspace 4:5.9.4-0ubuntu1
  ProcVersionSignature: Ubuntu 4.10.0-19.21-generic 4.10.8
  Uname: Linux 4.10.0-19-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
  ApportVersion: 2.20.4-0ubuntu4
  Architecture: amd64
  CurrentDesktop: KDE
  Date: Wed Apr 19 10:41:58 2017
  InstallationDate: Installed on 2015-06-05 (684 days ago)
  InstallationMedia: Kubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  SourcePackage: plasma-workspace
  UpgradeStatus: Upgraded to zesty on 2017-04-13 (5 days ago)

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