I'd urge you to consider the reason behind his suggestion though...
Regarding the speed, clearly you need it, but not that much of it. If you can barely see the cards, you're not even doing magic anymore, and you lose interest immediately. I had to watch it twice to fully comprehend what happened, and by that time I had realised what was happening.
In terms of the cascade, it really comes down to the balance between you liking it and killing the effect. I'm sure your performance style isn't to try and kill every effect you do, that in my opinion is a poor excuse for wanting to hang onto that motion. It's certainly nice but I felt it looked kinda dodgy too, at least until I realised how the effect worked.
I understand that you like how you perform it, but I would agree with dummyisdumb in saying that it's better to discard. I would however place less emphasis on the fact that it is a magician fooler or that the trick is beautiful in that it requires no sleights - these arguments, while certainly true, seem to me to be directed towards an appreciation of the magic that you do. It's certainly true, and appreciation is important, but there are other ways to show it, namely, improving a performance of any given effect.
I think it is better to discard it simply because it is a suspicious looking move, not specifically for magicians but in my opinion laymen too, since catching that cascade was a little messy.
As dummyisdumb said, Why make it seem like you do something when you don't?
There's no reason to hold back on the effect by offering a suspicious move, and I don't mean any offense whatsoever, but in my opinion it is best to let go of what you like in favour of what makes the effect more magical (an idea for many, many magicians). It might work for you emotionally but I don't feel it works for the effect and could potentially spoil a performance for others as well.
Peace
