In general...
When you upgrade your OS...
There will almost ALWAYS be noticeable performance boosts in
some categories...
However, this is temporary.
Old caches have been cleared out, sometimes completely eliminated... But as the ones grow and become populated, your performance gradually declines.
That said: Comparing benchmarks from just before the upgrade and immediately after the upgrade are simply not an accurate measurement of performance.
Bottom line: You can realistically gain performance increases in Catalina of 5%-15% over Mojave if you optimize your settings, especially pertaining to old 32-bit libraries and of course... have the right hardware.
- Notebooks: 2018 MacBookPro15,3 (Vega), 2019 MacBookPro16,1 and higher
- Desktops: 2017 iMac18,3 (4.2 i7), Macmini8,1 (3.2 i7) or iMac Pro (any model) or higher
- 32GB RAM+
- Nothing less than a Core i7
Needless to say, if you have that kind of hardware, you might as well make the jump to Big Sir. I've managed to tweak
Big Sir to get some seriously
BIG GAINS!