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Asked: 2026-05-22T17:52:28+00:00

Context: I’m building a little site that reads an rss feed, and updates/checks the

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Context: I’m building a little site that reads an rss feed, and updates/checks the feed in the background. I have one array to store data to display, and another which stores ID’s of records that have been shown.

Question: How many items can an array hold in Javascript before things start getting slow, or sluggish. I’m not sorting the array, but am using jQuery’s inArray function to do a comparison.

The website will be left running, and updating and its unlikely that the browser will be restarted / refreshed that often.

If I should think about clearing some records from the array, what is the best way to remove some records after a limit, like 100 items.

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  1. Editorial Team

    The maximum length until “it gets sluggish” is totally dependent on your target machine and your actual code, so you’ll need to test on that (those) platform(s) to see what is acceptable.

    However, the maximum length of an array according to the ECMA-262 5th Edition specification is bound by an unsigned 32-bit integer due to the ToUint32 abstract operation, so the longest possible array could have 232-1 = 4,294,967,295 = 4.29 billion elements.

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