Why is AAC slower than MP3 when importing?

I was getting 13x speed with MP3 (160 kb) selected, but only 8x with AAC (128). I could see a minor difference, but that seems like a big difference.
Thanks,
Alfredo

Regarding the quality of resulting tracks: AAC 128 is approx MP3 192.
Converting to AAC requires just more computing power as it results in smaller files with higher quality compared to MP3.

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Why is AAC slower than MP3 when importing?

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