Yeah, https://www.rockbox.org/wiki/CodecPerformanceComparison illustrates how FLAC was optimized for decoding efficiency.
Like, iPod Nano: FLAC decoding three to four times as fast as MP3 (... and Apple Lossless).
And a three-minute song of Monkey's Insane would decode in less than two hours, yay!
Even more impressive, take a look at my numbers here for FLAC: https://hydrogenaud.io/index.php?topic=82125.msg713417#msg713417
7 MHz for real-time decode stereo at 44.1 KHz. That is just 80 clock cycles per output sample. That is so few operations you could actually sit down and start calculating FLAC sample values on pen and paper in a reasonable time frame,