Hackintosh Catalina - Slow Extracting Zip Files

I upgraded from Mojave to Catalina over the weekend. I don't game on this machine and don't have the most powerful internals:

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i3 8100 CPU

16gb 2133MHz DDR4 RAM

4GB RX570

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Overall performance is snappy. No issues running multiple apps or any of the typical post upgrade Hackintosh headaches (full onboard audio and GPU support).

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The one thing that's been really strange: extracting zip files is extremely slow. As an example unzipping 1.55gb archive took over a minute to complete. On top of that, if I try to open files or apps while extracting, they take forever and also cause the extraction to slow down. The second the extraction is done, everything's back to normal.

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I'm at a bit of a loss -- has anyone seen this before? All my kexts are up to date, my SSD is about 2 years old but seems fine, my Geekbench scores are consistent with others that have similar hardware, and I believe my Vanilla install to be pretty clean; no extra kexts, boot is smooth etc. Open to any feedback/trying any suggestions anyone may have!