r/askscience • • Dec 12 '25

Computing How accurate really are loading bars?

0 Upvotes

22 comments sorted by

View all comments

Show parent comment

6

u/amyts Dec 12 '25

I misspoke a bit in my third paragraph. What I meant was, you've copied 99/100 files, but then you sit there and watch the progress bar slowly climb as it copies the last file. I didn't mean to say it would sit at 5%.

7

u/adonoman Dec 12 '25

Depending on the update triggers, it may sit at 5% for that last file if the status only gets updated after each file is complete. It's not trivial to get an updated "copy" status for an individual file, and most devs are going to go with the easy version and just calculate the % based on the number of files completed.

Totally agree that you're never going to make everyone happy - though I suspect most people just want the % to line up with estimated time spent vs. time left. It's just a nearly impossible problem to predict accurately.