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Why would you want it to slow down?
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I just love fast cloth. It makes me work on the delicasy end of my shot making techniques, instead of the power end of my shot making techniques.
Also when someone comes over and is used to slower cloth, I have a BIG advantage.
(And a note: I am using Simonis 760 on an 8-foot table)
As the cloth gets faster and faster, it become easier to see the physics of the pool ball on the pool table (especially easy with a measles ball).
Consider a ball rolling towards the rail with both top/bottom spin and side spin. On a slow cloth the side spin, top spin and the swerve all take place in the first blink of your eye as the ball bounces off the rail. With fast cloth you see the side spin alter the angle of departure, then the top spin arc the ball forwad and then the swerve move it just a hair more.
If you can see what the ball is doing, your mind will develop a mental model that is more atuned to the physics taking place. This model still works on slow cloth after a few minutes of play to get used to all the physics happening at once. but if yo only play on slow cloth you may never develope a really accurate model and end up wondering why you an't quite "get it" figured out.