Apple optimized the software to take full advantage of hardware with high thread counts:
This update marked a shift in system requirements, making the new minimum operating system. Logic Pro X 10.4.5
: Now supports up to 1,000 auxiliary channel strips. Sends : Increased to 12 sends per channel strip. MIDI : Support for 1,000 external MIDI tracks. Optimized for the New Mac Pro Apple optimized the software to take full advantage
: Significant improvements in responsiveness when opening the Mixer or resizing windows in large sessions. Technical Requirements Logic Pro X 10.4.5