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It's not hard to saturate your network connection when streaming things like raw images and point clouds (which you may be visualizing with image_view or rviz). There are a few things you could try:

• When subscribing to images, use one of the compressed transports (compressed or theora)
• Try throttling point clouds on the machine that publishes them. According to my back of the envelope calculation, the point cloud from a kinect creates about 140MB/s of data, which on its own could saturate a 802.11n link. You can throttle topics with topic_tools/throttle.