The USB Interface of CX3 can go upto 400 MBps. However, the other interface that acts as source for USB (say MIPI GPIF/ UART/ SPI/ I2C) might provide bottleneck.
The Throughput of the MIPI Interface depends on the data rate of the sensor and the way you configure the MPI Interface. CX3 internally maps the other interface to USB via DmaChannels that are created in the firmware.
please refer to our example projects to see how this is done.