I deleted everything from the folder and re-extracted the
It's not a CDL issue. There's nothing within CDL to control or limit download speeds. The only things you can change are the rates at which requests are made, or how many downloads are occurring simultaneously. Download speeds are reliant on your connection and the server from which you're downloading.
It really isn't. It's most likely just poor luck of the draw on which file server you are downloading from. Nothing in CDL limits download speeds. The downloading mechanics have essentially never changed, even from V4. If anything, downloads are faster now as I've reduced the number of requests that happen.