> Compression of preset -3 through -8 was slightly improved at the cost of a small decrease in encoding speed by increasing the precision with which autocorrelation was calculated (Martijn van Beurden)

Would love to see some benchmarks on this. Since FLAC hit 1.0 over 20 years ago, CPU speed has increased by ~100x, so a small hit on encode speed for better compression mostly doesn't matter. Then again, storage space has increased by the same amount, too.