Hi, sorry for my late response.

ludo@gnu.org (Ludovic Courtès) writes:

> Hello 宋文武,
>
> iyzsong@member.fsf.org (宋文武) skribis:
>
>> Hello, our progress report of 'guix download' can refresh too fast.  For
>> example, it blinks much with this script:
>
> Indeed, that’s always annoyed me.  I’m glad you’re looking at it!
>
>> [...]
>
> [...]
> (Also, longer-term, we’d want to do that other way around, which is to
> update the report every N milliseconds, as opposed to just printing
> something when a chunk has been transferred.)
>

Yes, so the elapsed time won't be freezed, and here is my try using
thread: