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28377D的FFT将输入输出的结构体定义在EMIF的外部SRAM上后,进行运算时用时会百倍增长,为什么?

我在cmd文件内,将外部sram的地址0x300000起,分了4个块出来,分别存放RFFTin1Buff、RFFTmagBuff、RFFToutBuff、RFFTF32Coef,当我进行FFT运算时,会比把数据放在GSRAM内的运算时间长了300倍左右,这是什么原因?