With that kind of toy I like to think of it as a sinking lure. You want moments of stationary the quick movement back to stationary slow movement. The goal is to provide different stimuli to goad their hunting instinct.
I just put the ‘toy’ on the cat’s face, like it attacked them.
It definitely gets their attention. I usually use something light so it doesn’t hurt them, just annoys them a bit.
But be careful, you might become collateral damage of the cat’s wrath.