calling function NvMediaImageGetBits takes too much time

I have found this issue in:
But no one is following it anymore.

My context:
I am running the demo “ipp_raw”. My camera configuration is “dvp-ss3322-rccb-raw12-1920x1208-ab”, whose output is raw .The IPP output is YUV. My SDK version is

I also found that When calling function NvMediaImageGetBits, it takes about 10 milliseconds of time. Is it normal? Or is there any other function I can use?