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I understand the llSensorRepeat as a task of a timer.
The system sets a timer to the given amount of time, here 30 seconds. Then the process ist going to sleep like in every other (realtime) OS. It is not using any resources, the countdoen of the timer is a task for the OS which is done automaticly, without any resource consuming.

The amount of cycles for things done by the OS in only one second is some millions instructions, so the time for example of 5, 10 or 30 secons is an eternity.

When it awake after this 30 seconds, it does it work an after that it is going to sleep again for an eternity.

I believe that a http-Request is more resource-consuming because it needs to do the Internet-Connections, the transport, the http-request, the answering, etc, etc.

When i have time, i will test it.

regards