Sorry to break the news, but ANY DC project will do that on a laptop!
The DF client already runs at the lowest possible priority, but your CPU usage will always be high because the client uses ALL the horsepower that you have that isn't in use by any other process.
You might want to experiment with auto or semi-automatic ways to run the project for a while (to be determined by you), then shut it down for a cooling-off period, then restart, etc. "Cycling" as it were. I haven't heard of anyone currently doing this.
If you work out something that does it for you, post it here for other folks!