There are 2 reasons given to strop fast...
1. To get the job done quickly
2. To create heat in the bevel/edge that will invoke the plasticity of steel to more easily burnish the bevel/edge and thus make it smoother & sharper.
Unfortunately this have never been shown to happen. It is purely a theoretical argument.
The downside to rapid stropping is that the risk of making an error greatly increases.
BTW, even with very slow stropping your edge can become so sharp that it will be uncomfortable to use. There is no need for rapid stropping or for rapid honing on a stone.