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It's a good idea to pause this if the your document tab is not even visible to the user. This saves your user's battery and data plan.

You can ask document.visibilityState Show archive.org snapshot whether this tab is visible:

function pulse() {
  if (!document.visibilityState || document.visibilityState == 'visible') {
    // do expensive thing
  }
}

setInterval(5000, pulse);

Supported in real browsers and IE10 Show archive.org snapshot . The !document.visibilityState in the code above assumes that the page is visible in case you have an old IE.

You can also subscribe to the visibilitychange event Show archive.org snapshot to be notified if visibility changes.