Okey guys i solved this i am on kubuntu i was having the exact same
problem, now to the solution

Go in System Settings > Display and Monitor > Compositor and change Rendering 
backend to xRender
if you still have the same problem get back into x.org/nouveau driver and thats 
it.

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https://bugs.launchpad.net/bugs/1684240

Title:
  Lagging square around mouse pointer

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