Is anvil.server.is_app_online() a cheap call?

I’d like to know if the client-side function anvil.server.is_app_online() is a cheap call (in the sense of CPU and network usage) that I could use for example in a timer which has a frequency of 0.1s.
For example if it would attempt to make an actual call to Anvil’s backend each time the function is run, it wouldn’t be suitable for a timer with such high frequency. Thanks for all input!

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