Please config “process-model=2” in config_infer_primary_centerface.txt.
In PGIE + SGIE mode, SGIE rely on the output from PGIE. FPS is decided by the whole performance of the pipeline but not simple PGIE speed and SGIE speed.
If you want to find bottleneck of the pipeline, you may test the component latency according to the DeepStream SDK FAQ - Intelligent Video Analytics / DeepStream SDK - NVIDIA Developer Forums.