For Photoshop 2020 on Windows, the minimum processor requirement is a multicore Intel or AMD processor running at 2GHz or faster with SSE 4.2 or later support and 64-bit compatibility; essentially, a modern, mid-range processor is recommended for optimal performance. 
 
Photoshop 2020 minimum requirements on Windows:
Minimum Processor: Multicore Intel or AMD processor (2GHz or faster) with SSE 4.2 or later support.
Operating System: Windows 10 64-bit (version 21H2 or later).
RAM: Minimum 8GB, recommended 16GB or more.