Here is a full speed video of an open/close cycle with no pressure:
Here is the same video at quarter speed:
Here is a quarter speed video of a second test at 750 psi line pressure:
With no pressure, the average frame count of the open and close was 8.5 frames which corresponds to 0.283 seconds/90 degrees
With the 750 psi line pressure, the frame count was 9.5 frames, or 0.317 seconds/90 degrees.