What does ROS 2 support for high bandwidth topics?

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DDS and ROS2 support both TCP and UDP transports. ROS2 also provides a more customizable quality of service. There is not any clear reason why ROS1 should perform better than ROS2 in video and point cloud streaming.

ROS2 is also well suited to work in real time using the RT_PREEMPT kernel (that may be useful to increase the determinism and reduce jitter in many situations). With ROS2 you also can switch between different DDS implementations that may show a better performance in some specific situations.

Some research studies show that you can achieve communications between two hardware components in a quite deterministic way with maximum latencies of 1-3 milliseconds (mostly under 2 milliseconds). https://arxiv.org/pdf/1809.07295.pdf

If you still want to check the network performance you can always use linux network standard tools for a rough analysis such as: iperf or bwm-ng

If you can go deeper you can be also interested in apex guys framework to analyze all these issues in a deeper detail: https://github.com/Irobot-ros/ros2-pe...