Fastest way of sending data to K210, so I can use KPU with external camera?

I’m trying to send image data to Maix Bit to use the KPU to process the image and send serialized data back, but I’m not sure if Serial USB connection is limited by the chip.
so I’m thinking about using a Teensy to receive data from computer and forward to Maix Bit via SPI or some other protocol.
Do you know maximum baudrate for USB Serial communciation with Maix Bit or SPI ?
Do you recommend using compressed JPEG data to use less bandwidth?
Thank you