Slow array count - how to improve?

Hi all,

I have a repeat, and a checkbox for each item in the repeat. I also have a ‘all’ type checkbox, that when checked, checks the remaining checkboxes in the repeat. Adjacent to this, I have the number of items selected.

E.g. if there are 20 in the repeat list, and I check the ‘check-all’ checkbox, then the count will say 20.

What happens which isn’t great UX is that the count counts up visually, intead of just turning from 0 to 20.

And often, it might take anywhere from 1 to 5 seconds to count from 0 to 20.

Any ideas team how I can improve UX and performance of this? @patrick you initially helped me out with the checkbox clear, so wondered if you have any ideas here?