Question Partitioning for different Mac OS Versions

Dec 14, 2019
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Hi,

I'm partitioning my 1TB SSD to allow me install Mountain Lion, Yosemite, and Catalina. I have a quick question.

I'd like all my files to be on one partition, apart from specific software which only function on Mountain Lion and Yosemite. Would it create a slower performance if the software is having to access files that are saved on another partition?

Thanks!