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Cause of compiling speed differences Fedora 33 WS vs Ubuntu 20.10?

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  • Cause of compiling speed differences Fedora 33 WS vs Ubuntu 20.10?

    Hi,

    even when using the same kernel (5.11-rc3) and kernel config and the same gcc (10.02) with same flags on the same machine,
    Fedora 33 WS finishes any code compilation 10% to 25% faster than Ubuntu 20.10.

    Example:
    Kernel Compilation: 126min vs 143min (user)
    CERN ROOT compilation: 177min vs 224min (user)

    Out of pure scientific curiosity:
    What is the reason for that massive difference?
    (Test machine: ryzen 2700x, 16GB, nvme)
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