Steam may appear to throttling you by lowering your download speed by a lot. This is not LS fault in any way but instead the way Steam handles downloads and I have a way to fix that very easily.
1.Open the steam client and login if need; NOT a steam game.
2.Click the steam menu and click settings.
3.Click Downloads then remove the check that is checked for "Throttle downloads while streaming"
You should now be able to download anything at fast, steady fast rate!