I'd like to know how important it is to utilize speed in noting practice. On a personal level I find that there is so much going on that I could note all sorts. I have followed advice to concentrate on the most prominent feature in my field of awareness and always return to the rising and falling of the abdomen adding sitting when the space between the arising and falling becomes very clear. Fine.
In MCT Daniel talks of intense speed in noting practice and it makes me think of a person on speed

My question then is what speed should be aimed at? Should the speed increase naturally, or is it a conscious decision that the pratitioner makes? When noting more slowly, say once/twice a second, space occurs in which there is no mental chatter and perception becomes clearer. Intense speed, at least in my limited experience of 'speeding up' the noting seemed to create a sort of mental intensity that imposes the label on the arising object instead of giving it space to do its thing i.e. rise and fall. Am I missing something?
Any thoughts dharma bods?