+1 on graphics and hyperthreading.
Do you use a lot of VIs? There are a lot of people offloading VIs to Vienna Ensemble Pro see this video
https://m.youtube.com/watch?v=jGP7-bxPJXU
Also try closing both the mix and edit windows (keep the system usage window open) to see how much that reduces CPU usage (mine drops by about 10% on my cheese grater Mac).
You can also check how much your graphics card is being taxed while running your sessions using the activities monitor window.
Be aware that pro tools is only optimized for 1080p so try a lower resolution or if you have a screen with a max resolution of 1080p try that.
Best,
James
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__________________
James Welch
Recording Engineer | Producer
Masterlink Productions
Mac Mini 8,1 (2018) | 3.2 GHz 6-Core Intel i7 | 64GB Ram | Apple 27" LED Cinema | 2TB System Drive | LaCie Rugged USB-C 2TB SSD NVMe Audio Drive | UAD-2 Quad Satellite (Firewire)
macOS Catalina 10.15.7 | Pro Tools Ultimate 2021.7 | Avid HDX TB3 Chassis | HDX | Avid Omni | Avid 16x16 HD I/O x2 | Digidesign 192 | Digidesign C24