Low FPS sensor_msgs::Image Ethernet

edit

Hey all,

I have a camera ROS publisher that's transmitting at 35fps (800x600 - RGB8). I have that pc connected to another one (via router, Ethernet, only the 2 pc's connected to router - no internet).

The receiving PC is only getting receiving the images at 1.5fps! Image is a cv::Mat, transmitted as sensor_msgs::Image.

Does anyone know how to get the maximum frame rate possible, as 1.5fps makes it impossible to do what I need to do with it?