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Does setInterval make a website sluggish?

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Oct 19.2009

Hi, I’m currently considering implementing an Ajax script a lá:

[url]http://yensdesign.com/2008/11/creating-ajax-websites-based-on-anchor-navigation/[/url]
And [url]http://beski.wordpress.com/2009/04/21/ajax-pagination-with-anchor-navigation/[/url]

Both of the scripts use a setInterval function, set to every 300ms. I was wondering if this would make my website slow or anything in that manner (particularly slow/old computers) to a noticeable degree?

Thanks for your time

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JavaScript

4 Comments(s) ↴

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@thraddashOct 19.2009 — Just remember that setInterval will constantly fire even if the previous Ajax request has not yet completed, unless they have checks in place.
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@sorenchrauthorOct 19.2009 — Just remember that setInterval will constantly fire even if the previous Ajax request has not yet completed, unless they have checks in place.[/QUOTE]

Right, assuming that such an event is accounted for in the code, would the constant hash-checking make the website sluggish?
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@thraddashOct 19.2009 — Hash checking in Javascript is actually very fast in my experience. From the links you provided they don't constantly communicate with the server, so I don't think you will have much of an issue.
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@rnd_meOct 19.2009 — you could speed up the code on the second link considerably by getting rid of the call to eval() every 300ms. eval is slow, and pointless in this code. I don't understand why people stringify timed out function calls, use the dang reference people!

anyways,

[CODE]$().ready(function(){
setInterval("checkAnchor()", 300);
});[/CODE]

into
[CODE]$().ready(function(){
setInterval(checkAnchor, 300);
});[/CODE]
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