system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is it when you download something, it generally downloads at a constant rate, until 99% where it seems to stop and take a lot longer to reach 100%?
gpt
because the file is most likely downloaded to a temp directory then copied in its final destination when it's finished.

the last 1% is longer because of the time it takes to write the file on your disk. 

most likely, unless you use an SSD.