The causes and fixes for mouse lag seem many and varied. Maybe one day .......
http://answers.microsoft.com/en-us/...ndows-10/143e65d7-6b26-48b1-9fe2-63a948be700d
http://answers.microsoft.com/en-us/...ndows-10/143e65d7-6b26-48b1-9fe2-63a948be700d