flac
AMD Athlon II X2 250 testing with a Gigabyte M720-US3 and NVIDIA GeForce GT 240 on Linux via the Phoronix Test Suite.
HTML result view exported from: https://openbenchmarking.org/result/1308105-UT-FLAC6497516.
FLAC Audio Encoding
WAV To FLAC
Phoronix Test Suite v10.8.4