High Sierra vs Catalina performance in same system

I posted this on another forum here, but it may be more suitable here:

I have both High Sierra and Catalina installed, on 2 respective SSD's. in the same system. However, I get vastly different Geekbench 4 scores for each.

High Sierra Single Core score = 3413
High Sierra Multi Core score = 16183

Catalina Single Core score = 1601
Catalina Multi Core score = 9489

Installed using Unibeast and Multibeast.

As you can see this is a huge difference. Any help would be appreciated.

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