Even though Shadow is VM (Virtual Machine), it's still a physical machine doing Work.
Secondary is the Local Machine also using its Resources to stream.
1. If you wish to Max Game Settings, you might need to build a Gaming Rig. Might.
2. If you wish to Max Speed Settings, you might need to secure a TB+ speed package from your ISP. My ISP splits data between 10 Devices at any given moment.
3. Remember Shadow dynamically replaces "components", so you don't have to.