Does Salad use all of my Gaming PC’s resources?

This depends which of Salad's workloads you are running on your machine.

Salad does not use your CPU for mining, but it is utilized for CPU Container workloads. CPU Containers are very light weight, and do not interfere with gaming or media like Netflix. CPU Containers can run safely in the background of while you do most tasks on your machine. 

For GPU mining and Container Workloads, Salad will fully utilize your Graphics Card (GPU) while running. This means that applications which rely on your GPU may not be able to run smoothly, if at all. This includes gaming, media applications, and (of course) GPU cryptomining. However, some programs do not need your GPU to function, like Google Chrome and Microsoft Word. These applications should run fine while Salad chops away in the background.