- parameter source: Animate > u / v / tRange (in this example, any other vector in your files)
now each frame take a progressive position of the source variable as "t" value
- animation speed: Frame rate > ###
f.e. "frame-rate > 2" means 2 frames per second
- loop settings: Frame rate > No animation / Play once / Repeat Indefinitely
selecting "No animation" you can see each frame step-by-step with ALT+left / ALT+right