mpc_170kbps (nano 2)
all    33.45 MHz
-dewindowing    12.61 MHz = 20.84
-dct32           7.51 MHz =  5.10
-memmove         5.88 MHz =  1.63 (f-bank = 27.57)
-requant         3.91 MHz =  1.97
-bitstream            =  3.91

PG_enc_mp3 ~220kpbs (nano 2g)
all    52.27 MHz
-dewindowing    29.54 MHz = 22.73
-dct32          24.03 MHz =  5.51 (f-bank = 28.24)
-imdct/overlap  12.04 MHz = 11.99
-freq_inv       10.10 MHz =  1.94
-alias_reduce    7.64 MHz =  2.46
-reorder         6.74 MHz =  0.90
-bitstream                =  6.74