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Avoid using unbuffered reads when "seeking" to a keyfile offset. This is abysmally slow when the key is hidden at the end of a large device. Instead, try to actually call lseek, falling back on reading in chunks of BUFSIZ bytes until the desired offset is reached. Command line: cryptsetup luksOpen /dev/vdc1 home \ --keyfile /dev/vdd --keyfile-size 4096 --keyfile-offset 123456789 Before: real 0m25.589s user 0m7.030s sys 0m18.479s After: real 0m4.464s user 0m4.253s sys 0m0.157s
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