I did some testing, using an Intel Core i5-4460, here are my results:
CLI encoder: flac.exe
Destination file: G:\MP3\CD-Backup\Alice In Chains - 1992 - Would [COL 668328 2]\Alice In Chains - Would.flac
Encoder stream format: 44100Hz / 2ch / 16bps
Command line: "C:\Users\*\Desktop\flac-1.3.1-git-7251201-win32\flac.exe" -s --ignore-chunk-sizes -8 - -o "Alice In Chains - Would.flac"
Working folder: G:\MP3\CD-Backup\Alice In Chains - 1992 - Would [COL 668328 2]\
Encoder process still running, waiting...
Encoder process terminated cleanly.
Track converted successfully.
Total encoding time: 0:05.257, 122.78x realtime
wav-cdda: 108 MB
flac: 74.4 MB
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CLI encoder: flac.exe
Destination file: G:\MP3\CD-Backup\Alice In Chains - 1992 - Would [COL 668328 2]\Alice In Chains - Would.flac
Encoder stream format: 44100Hz / 2ch / 16bps
Command line: "C:\Users\*\Desktop\flac-1.3.1-win-for_older_intel_CPUs\flac.exe" -s --ignore-chunk-sizes -8 - -o "Alice In Chains - Would.flac"
Working folder: G:\MP3\CD-Backup\Alice In Chains - 1992 - Would [COL 668328 2]\
Encoder process still running, waiting...
Encoder process terminated cleanly.
Track converted successfully.
Total encoding time: 0:04.087, 157.93x realtime
wav-cdda: 108 MB
flac: 74.3 MB
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CLI encoder: flac.exe
Destination file: G:\MP3\CD-Backup\Alice In Chains - 1992 - Would [COL 668328 2]\Alice In Chains - Would.flac
Encoder stream format: 44100Hz / 2ch / 16bps
Command line: "C:\Users\*\Desktop\flac-1.3.1-win-lvqcl\flac.exe" -s --ignore-chunk-sizes -8 - -o "Alice In Chains - Would.flac"
Working folder: G:\MP3\CD-Backup\Alice In Chains - 1992 - Would [COL 668328 2]\
Encoder process still running, waiting...
Encoder process terminated cleanly.
Track converted successfully.
Total encoding time: 0:03.244, 198.97x realtime
wav-cdda: 108 MB
flac: 74.3 MB
----------------------------------------------------------------------------------------------------
CLI encoder: flac.exe
Destination file: G:\MP3\CD-Backup\Alice In Chains - 1992 - Would [COL 668328 2]\Alice In Chains - Would.flac
Encoder stream format: 44100Hz / 2ch / 16bps
Command line: "C:\Users\*\Desktop\flac-1.3.1-x64-icl-rarewares\flac.exe" -s --ignore-chunk-sizes -8 - -o "Alice In Chains - Would.flac"
Working folder: G:\MP3\CD-Backup\Alice In Chains - 1992 - Would [COL 668328 2]\
Encoder process still running, waiting...
Encoder process terminated cleanly.
Track converted successfully.
Total encoding time: 0:03.464, 186.33x realtime
wav-cdda: 108 MB
flac: 74.3 MB