When you run someone over the game screenshots your screen to detect any cheats. However, that seems to be no longer functional and this has been a thing for quite a while. They would stay stored on files.perpheads.com for 24 hours until they would get deleted automatically, this kind of info was useful not just for cheating but also to quickly conclude if a person was driving on the wrong side of the road. If I recall correctly this has been a thing as early as V1 or V2 and got to know a bit more about the screenshot function as staff. I do not know if it's fixable client side (even with a screenshot blocker, naughty people) so you will have to live with it no matter the specs. Don't bother installing the game on SSD, screenshotting will always lag your game as it's a engine problem. Ever spammed left click with the camera?
Source: Myself and Bolli