A 24MP file is fine on CS6. A 45MP or 61MP file (Sony A7R IV/V) will choke CS6. The 32-bit architecture (and lack of GPU acceleration) means waiting for sliders to update.
: To use modern Lightroom edits in CS6, users must often select "Edit a Copy with Lightroom Adjustments" to bypass compatibility issues with newer RAW camera files. Why Photographers Still Search for "CS6" adobe lightroom cs6
So, why should you use Adobe Lightroom CS6? Here are just a few benefits: A 24MP file is fine on CS6
It will continue to work as long as you do not upgrade your OS or hardware to a version that no longer supports it. adobe lightroom cs6