a script on this page is causing ie to run slowly

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Long running scripts are detected differently by different browsers:

  • IE will raise the warning once 5 million statements have been executed (more info on MSDN)
  • Firefox will warn if the script takes longer than 10 seconds (more info on MDN)
  • Safari will warn if the script takes longer than 5 seconds
  • Chrome (1.0) has no set limit and will simply keep trying until an OutOfMemory exception at which point it crashes
  • Opera will just continue to run forever, without warning.

Nicholas Zakas has written an excellent article covering this topic.

As such – the best way to avoid these problems is by reducing looping, recursion and DOM manipulation.

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