I've been kicking that around in my head. Didn't start trying any calculations or anything. There are charts for speeds for materials, I typed scroll saw speed charts on the search. Should have looked closer. Though speed charts for drill, circular saws lathes, bandsaws seem to have a common factor. They seem to give speeds for materials, ie metal, wood, steel, AL, bronze. The circular saw is rotational speed, drill rotational speed, lathe rotational speed. The bandsaw starts rotational, but the blades are a linear speed going one direction. Scroll saw is linear going two directions, traveling so far one way and so far the other, so a conversion of distance would be similar. All these machines tend to have charts that give a speed for a material.
The scroll saw on this board is basically wood blade, some metal, so if a chart shows a slower speed for metal on other machines, the scroll saw would probably be similar. The scroll saw motor is normally smaller, so speed might compensate for thicker material, though that's going to be a preference. I've been packing and taking a break for my back and didn't do a very good search for a scroll saw speed chart. Wonder, would other machine charts give a sense of speed for the same materials? Just check the board after killing my back for the day. RJF