❯ shards build --release -Dpreview_mt
Dependencies are satisfied
Building: qr_test
❯ CRYSTAL_WORKERS=4 ./bin/qr_test "A fast and efficient QR Code encoder/decoder library written purely in Crystal. It is significantly faster (4-10×) and uses fewer heap allocations (-95%) compared to the other implementation in Crystal (spider-gazelle/qr-code), and it supports wider QR Code standard features such as Kanji mode encoding. It also supports generating Micro QR Code and rMQR Code symbols."
goban 2.45k (408.47µs) (± 6.31%) 95.3kB/op fastest
qr-code 168.07 ( 5.95ms) (± 2.17%) 2.55MB/op 14.57× slower
❯ CRYSTAL_WORKERS=8 ./bin/qr_test "A fast and efficient QR Code encoder/decoder library written purely in Crystal. It is significantly faster (4-10×) and uses fewer heap allocations (-95%) compared to the other implementation in Crystal (spider-gazelle/qr-code), and it supports wider QR Code standard features such as Kanji mode encoding. It also supports generating Micro QR Code and rMQR Code symbols."
goban 3.41k (292.99µs) (± 2.03%) 95.3kB/op fastest
qr-code 173.34 ( 5.77ms) (± 1.81%) 2.55MB/op 19.69× slower