I just purchased this laptop for my wife, Dell Inspiron 15 i7559

Buy Dell Inspiron 15 i7559-5012GRY Signature Edition Laptop - Microsoft Store

Opened up box, updated all drivers etc. and for whatever reason the mouse cursor on the desktop moves really slow and on screen movement is way behind the trackpad finger movements. If I have an app open, internet browser, any app, the mouse pointer behaves normal. If the app is snapped to half the screen, mouse pointer is fine over half with the open app, but slow on the desktop half.

When I boot up, the mouse behaves fine for about 10 seconds until all drivers/startup apps load, then it goes back to a crawl.

Any suggestions?

i7 6700, nvidia 960m paired with Intel 520 i think, 8 GB ram