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Why is TLS Decryption is MUCH slower on Windows 10 than MacOS?

My colleague has a Macbook Pro w/ i7 3.3Ghz w/ 2 cores & 16 GB RAM, while my windows 10 pro laptop has an i7 w/ 6 cores & 32GB RAM. We were using a PMS file to decrypt some HTTPS traffic, and his laptop decrypted an 800MB pcap in around 1 minute, while mine wasn't even 1% done after 4 min. I had another colleague test w/ a similar Windows 10 laptop with identical results.

Why is wireshark on Windows 10 so slow at decrypting TLS???