It takes FOREVER to simply get through a session of downloading Stock and last thing I feel like doing right now is going through a session with support but I have not choice! I'm too frustrated right now to bother with that even! Sessions times out, requires me to relog in over and over and over! I've been at this all day today and it's ridiculous! This is ridiculous Adobe. I'll contact support during the week when I'm not so upset ..... grrrrrrrrrrrrrrrrrrrr!
[Moderator edited Title for clarity. Was: So frustrating!]
Sorry about your troubles.
I can say that downloading performance is normal and there is no special lag. However, there is (probably still) a known issue with libraries containing a lot of assets (100+). The solution to this is to split the libraries into smaller junks.
I'm sorry you are having trouble with downloads. I'm going to guess that you are downloading from your browser. Let us know if this is not the case.
Please let us know what you discover, your reply can help others.