Is setInterval CPU intensive?

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I don’t think setInterval is inherently going to cause you significant performance problems. I suspect the reputation may come from an earlier era, when CPUs were less powerful.

There are ways that you can improve the performance, however, and it’s probably wise to do them:

  1. Pass a function to setInterval, rather than a string.
  2. Have as few intervals set as possible.
  3. Make the interval durations as long as possible.
  4. Have the code running each time as short and simple as possible.

Don’t optimise prematurely — don’t make life difficult for yourself when there isn’t a problem.

One thing, however, that you can do in your particular case is to use the onhashchange event, rather than timeouts, in browsers that support it.

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