Why does the download speed drop when synchronizing with cloud storage

Question

Computer networks

Perhaps a question out of banal ignorance. Currently downloading several gigabytes of information to google drive, the feeling is about the same as if I were downloading something via torrents at full speed.
The question is simple, why if I upload to the cloud, and not vice versa, is my download speed so cut?
My options: a
smart provider
in parallel cloud compares files, respectively, the file is uploaded and immediately downloaded (but why not compare hashes)

Answer 1

ADSL?

Answer 2

Do you have half duplex enabled?

Answer 3

In the TCP protocol, data reception must be acknowledged by response packets. Probably in your case, these packets get stuck in a channel that is full of outgoing traffic and the party transmitting to you is forced to suspend transmission. This situation indicates the absence of QOS settings.