I have a 300-image (NEF) folder where I highlighted all images, turned on Auto Sync, then adjusted the sharpness, noise and applied lens corrections. LR Classic has taken about 15 minutes to process 50% of them. When inspecting the CPU, it's only being 10% utilized (out of 1600%)... basically the system is idle. -- 8700K@5GHz with 64GB 3GHz DDR4 ram.
// Sean //
Mac Studio Ultra • 128GB RAM • 48-core GPU • 2TB SSD • 32" LG OLED • Nikon