The faster the preset, the lower the encoding time and CPU/Memory usage, but also the lower the quality and higher the file size.Although the quality difference might not be very significant.
https://trac.ffmpeg.org/wiki/Encode/H.264#Preset
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The faster the preset, the lower the encoding time and CPU/Memory usage, but also the lower the quality and higher the file size.
Although the quality difference might not be very significant.