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Pointclouds are extremely demanding in terms of bandwidth and space usage. I am surprised to see that you are recording at full frame rate. Unless you really have a fast computer (at least an I7 processor) you will have problems running rosbag play on a pointcloud bag and rviz on the same machine.

You should have a look at various pointcloud compress packages, for example:

• Compressed Pointcloud transport
• pointcloud_compress This is very simple as pubishes a zipped message, and it has the unzipper as well. The power of Python!

As a rule of thumb, always try to save the pointcloud from the same computer it is producing it, and load it from the same computer it is processing it.