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Official binary:
Code:
bzip2.exe -zfk enwik8: 13.422 s
bzip2.exe -dfk enwik8.bz2: 4.703 s
Optimized build:
Code:
bzip2.exe -zfk enwik8: 9.656 s
bzip2.exe -dfk enwik8.bz2: 3.688 s
Compression is 28% faster, decompression 22%

Amazing speedup