Certain file downloads stall out & general delay on receiving files

[Alphastaire]

I've noticed that certain file downloads stall out on the client. For example, this screenshot gets stuck at 88% without fail.

Another screenshot I found gets stuck at 74%.

I am unsure what determines the exact % they get stuck at.

In my tests, they both eventually finish downloading after 14-15 minutes consistently. My assumption is something times out after a set 15 minutes and allows the download to finish. Currently, I'm not sure what is causing this. I can confirm without a doubt that it's a client issue after comparing against different clients on the same server, as they have no delay at all. A friend corroborates that this issue happens with the upstream project too.

I have also noticed other issues with the file system - there are often times where it takes unusually long to show or pick up that a file was received.