CircleRamp lagtime

Hi guys, a question about Circle Ramp.

I’ve noticed that, with the same lagtime, CircleRamp takes quite more time than PanAz for the sound to move around the circle of speakers in a multichannel setup, at least a the beginning of the time interval.
It sounds to me as the CircleRamp has a sort of logarithmic curve.

Is it just an impression of mine?
Is there a way to make it react more “linearly”?

Thank you very much for your help and btw, merry xmas