hz of our sensor's the topic was DECREASED, When I record some data with rosbag. [closed]

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Hello, experts.
I used rosbag to acquire our sensor data as camera, lidar.
You can reference below spec.

Camera Node : 1980x1208 (FHD, RGB), 20 hz
Lidar Node : 64 Channel, 20 hz

I recorded topics on pc using rosbag, but there is a decreasing.
// command $ rosbag record camera_topoic lidar_points_topic
When I check on another pc, their spec are blew.

Camera Node: 20 hz -> 5~6 hz Lidar Node: 20 hz -> 8~10 hz

I don't know where it depend on which problem. How can I debug this problem? Is there a general information which is good for this problem.