H265 intrarefresh is increasing decoding time considerably

[gehee]

I have an h265 with intrafresh enabled.

Without intrarefresh in my stream, mpp is able to decode any frame at an average time of 1.2ms, 3 ms MAX.

Now for mpp to decode the video smoothly on rk3588, I enable MPP_DEC_SET_PARSER_SPLIT_MODE which slows down decoding time considerably. Decoding time jumps out considerably: 9ms average and max 30ms. Without MPP_DEC_SET_PARSER_SPLIT_MODE, the decoded video shows artifact and decoding time is still 21 ms max instead of 3ms (average is 1.64ms though).

Is it possible to decode an h265 stream with intrarefresh enabeld smoothly without enabling MPP_DEC_SET_PARSER_SPLIT_MODE on the mpp side to keep decoding time under 3ms like the non-intrarefresh enabled stream?