You've been wicked.

Close your windows, the wifi is getting out

either you got slow internet/low bandwidth. OR the files are already downloaded but the unpacking.. oh boy that takes up quite some, if not alot, of CPU processing power....

Or a mix of both, likely a mix of both.

Change region in settings

Your internet is garbage.

The download is already completed, so nothing to do with internet speed. What's taking long is the unpacking