The showdown between JSON and a hefty JavaScript array

Currently, I am developing a jQuery autocomplete feature that will need to handle between 10 to 20k records.

The dataset is static, and I have the option to either retrieve it from a JSON file or embed it directly into the page using a single line of code like this:

var title = ["example title 1","example title 2"];

From a performance perspective, which method would be more efficient? I am also concerned about potential browser crashes or lag. Additionally, how does XML fit into this decision?

It's worth mentioning that my PHP script already includes a cache system for the HTML content.

javascriptperformancejson

Answer №1

Opting for JSON instead of AJAX to retrieve data could enhance your page's loading speed. Utilizing WebWorkers, if they are supported by the system, to parse the JSON in a separate thread can further optimize performance. This approach is highly recommended.

A JSON file size of 500kb is unlikely to impose a remarkable parsing overhead, so there should be no concern about causing browser crashes.

Answer №2

It is advisable to place the array in a dedicated .js file and then load it using <script>. By doing so, the browser can cache it independently from your HTML page, which is likely to undergo more frequent modifications.

Answer №3

When it comes to performance, opting for arrays is the superior choice. Despite JSON being a natural JavaScript format, the instantiation of objects from JSON is slower compared to creating an array of strings. Additionally, arrays are also more compact and result in faster network transmission.

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