What do the dots next to the fps counter mean?

Taken from the forums: http://us.battle.net/forums/en/overwatch/topic/20744844281
(which is quoting something posted on reddit, with no direct link to original post.)

  • one dot means framerate is simulation bound (lots of gameplay to sim, GPU/render is fine)
  • two dots means GPU is saturated
  • three dots means the Render thread (which feeds the GPU) is limiting the framerate