If you click the Show All Downloads button, that information is available in the Library dialog (see attached image).

There apparently is a way to switch back to the old download manager. I haven't tried it myself. Check out this thread: Got new version, want to go back to previous download box, the new one has no history and doesn't show speed of download, how do I go back?

I kinda like this new one, but I want it to show download speeds! It's stupid having to click it, then click "show all downloads." Please.

Hi djvtech, I read about a way to do that. When you hover your mouse over the download, the tooltip that displays shows the speed. Inserting that tooltip into the actual Download Panel is possible but it's somewhat complicated. See this thread: Is there any way to make the new downloads panel show the current speed of a download?