Hazel battery usage?

Hello! I'm about to buy a license and it may be a dumb question but I'd like to know how much resources (battery, CPU, RAM) Hazel is using.
I try to keep my Mac running mostly native apps because there is one thing I really don't like: Resource hogs that let your battery run hot and stress the system without any reason.
I could imagine that constantly listening to a folder or subfolder if a new file appears uses a lot of energy?
I'm really thankful for any answer!
I try to keep my Mac running mostly native apps because there is one thing I really don't like: Resource hogs that let your battery run hot and stress the system without any reason.
I could imagine that constantly listening to a folder or subfolder if a new file appears uses a lot of energy?
I'm really thankful for any answer!