Sad trombone.

gistfile1.txt

Core 0:
encode (x1)      : 4.526 seconds, 183.25 ns/B, rate= 5.46 MB/s
decode (x50)     : 132.080 millis, 5.35 ns/B, rate= 187.01 MB/s

Core 4:
encode (x1)      : 7.672 seconds, 310.60 ns/B, rate= 3.22 MB/s
decode (x50)     : 185.233 millis, 7.50 ns/B, rate= 133.35 MB/s