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why c6run is more slowly than arm only?

Other Parts Discussed in Thread: DM3730

i'm trying to use c6run app on beagleboard-xm ( dm3730) platform. 

when i'm  running  application of examples ' cfft_arm', the time consumed is as follws:

 

/mnt/c6run-apps/examples/c6runapp/emqbit # ./cfft_arm 
N=16,nTimes=100: 0.000732 s
N=32,nTimes=100: 0.001984 s
N=64,nTimes=100: 0.004334 s
N=128,nTimes=100: 0.010437 s
N=256,nTimes=100: 0.023285 s
N=512,nTimes=100: 0.052399 s
N=1024,nTimes=100: 0.116546 s
N=2048,nTimes=100: 0.256378 s
N=4096,nTimes=100: 0.559997 s
N=8192,nTimes=100: 1.2132 s
N=16384,nTimes=100: 2.61063 s

but when i 'm running 'cfft_dsp', it shows :
/mnt/c6run-apps/examples/c6runapp/emqbit # ./cfft_dsp
[ 3001.213562] omap_device: omap_hsmmc.0: new worst case activate latency 0: 366210
N=16,nTimes=100: 0.008 s
N=32,nTimes=100: 0.021999 s
N=64,nTimes=100: 0.052 s
N=128,nTimes=100: 0.125 s
N=256,nTimes=100: 0.289 s
N=512,nTimes=100: 0.656 s
N=1024,nTimes=100: 1.467 s
N=2048,nTimes=100: 3.252 s
N=4096,nTimes=100: 7.153 s
N=8192,nTimes=100: 15.67 s
N=16384,nTimes=100: 34.097 s

why th application using c6run consumed more time than the application using arm-only?