you have to start it from a terminal to see the output of calculated frames.
With a proprietary nvidia-driver, you should get a few thousands of frames per 5 second measure.
With a default (only 2d-driver, like noveaux) there should be only a few, a lot less than 10.000 frames/5-seconds.
Next, did you check, you dont suffer from other cpu-wastings?
For example a lot blender-versions need to be switched to SDL or even sound=None in user preferences to avoid some overhead …