10.2 intermittently slow

I have been using 10.2 for a few weeks and I notice at certain times of the day it becomes so slow as to be unusable. I have tried to find a performance issue on my PC or network but have been unable to determine a cause. I select a polygon to move and I start to move the cursor and it takes 20 seconds or more for the polygon to start following the cursor. When this happens, snapping ceases to function. if i close the map and try again 30 minutes later, it may or may not have rectified itself.
Anyone else experiencing anything like this?