Controlling animation speed

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How can I reduce the speed of replay of animated plots (in CoCalc)? Ideal would be a player with a frame rate slider and play/pause. Addendum: I found that apparently I can reduce the speed by adding more frames by reducing the step size of the animation with the 3rd parameter of sxrange in the definition of the animation(? is this correct?).

However, when I use this parameter with value 0.4 in my animation (combination of 2 implicit_plot3d objects) I only get a warning

WARNING: 1 intermediate output message was discarded.

while the animation renders well if I don't use this parameter or use it with value 0.5. The rendering of each of the images separately with a step size of 0.1 works.