Very poor CPU-performance due to Catalina?

Hi!

I need help with a rather old system.
I experience very bad cpu performance since upgrading to Catalina.
I'm a music producer working in Ableton Live and Logic Pro.
I suddenly have a lot of crackles and dropouts although when monitoring Intel Power Gadget the Cpu barely runs over 1ghz.
Also got a very poor Geekbench score compared to when i was running Sierra.


My system:

z170x Designare
Intel Core i7-6700K
64.00 GB 3000 MHz DDR4
Intel HD Graphics 530 1536 MB
UAD Apollox4 thunderbolt...

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