A 2012 MacBook Pro 13" running macOS Sonoma via OCLP scores 850-900 on Geekbench 6 (Single Core). Native support for that machine on Catalina scores 870. The difference is statistically negligible.
Target your (not your internal hard drive yet). open core legacy patcher download
Once you have the ready, follow these steps: 1. Download macOS A 2012 MacBook Pro 13" running macOS Sonoma