This paper first analyses the relationship between performance and complexity of several state-of-the-art coding algorithms for high resolution videos. Based on the coding efficiency comparison under different config parameters and the intra mode usage in P/B frame, this paper presents a practical scheme to improve the coding speed with slight quality loss. And a DSP-oriented two-level internal memory organization is also proposed to keep pipeline processing. In such organization, block correlation caused by motion vector predictions is lightened while keeping almost the same performance as the original.