Steam downloading is taking too much CPU

[Amazing_Pony]

Hello, when I am creating new Counter Strike Global Offensive service, it starts process Steam at windows and its downloading 1 Gbit/s and its taking 30-40% CPU.
Is possible to limit this? for example how fast it can be downloaded + limit CPU usage while downloading from steam?
IF I go to game tools and predownload the game, its not doing that, so I am assumming that I need to predownload all games for all nodes.
Is possible to prevent this? Like limit the steam cpu usage to just 1 core for example and reduce download speed? thanks a lot