For what it might be worth to some reading this thread ...
I've slowed down; a lot.
Back in the 90's I was always in a hurry; I worked long hours, I drove fast so that I wouldn't waste time in the car, I ate out for convenience, etc. And I was often frustrated, annoyed, inconvenienced, irritated, agitated, angry, disappointed, dissatisfied, etc, etc.
Now, I drive slower, I walk slower. When I'm hiking, I take my time and enjoy the wildflowers, plants, trees, sun, sky. When I go to town, I take the backroads, avoid the race on the interstate. I cook. My days are peaceful and joyful. I am content and happy. I am not in a hurry to do anything. Sitting here by the window, looking out at the far ridge bathed in sunlight, white clouds in a blue sky, there isn't anywhere else I want to be right now.
I mention this because often we are in a hurry because we want to be somewhere other than where we are now. But you can't actually be anywhere other than where you are now. Realizing this can be an opening to finding peace, for those who find themselves from time to time somewhat ill at ease.
So I suppose an answer to the question might be that if you are at peace, if you are happy and content, if you find joy in your day, then perhaps there is no need to slow down or speed up. Where you are right now is the only place you need to be.