We are testing the newly baked SSE modifications FFT / MDCT
I wrote for my 
creation SSE-implementation of complex FFT and MDCT. The results even amazed me:
| conversion / option | without SSE | SSE modification | 
|---|
| 2000000 * FFT-128 | 16.7s13.3s | 5.1s3.7s | 
|---|
| 1,000,000 * MDCT-512 | 17.4s15.3s | 10.4 s | 
|---|
Two million 128-point complex FFTs and one million 512-point MDCTs were calculated. Intel® Core (TM) 2 Duo CPU E8400 @ 3.00GHz
I wonder if this can be sold or licensed to someone? :)
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Source: https://habr.com/ru/post/64638/
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