What could be causing the sudden increase in time taken for AJAX requests, going from a mere 2 milliseconds to over 50 milliseconds?

Recently, I developed a script using jQuery for AJAX that allows me to "ping" the server and measure the time it takes for my AJAX requests to complete.

var start = Date.now(), end = 0;

setInterval(function() {
    $.ajax('', {
        complete: function() {
            end = Date.now();

            console.log(end - start);
        }
    });
}, 1000);

After implementing this script, the output pattern I observed was:

39
2
4
2
3
40
3
2
3
4
2
61
9
4
3
2
2
4
34

I found it interesting how the duration of the "ping" jumps from lower numbers like 2 or 3 to higher ones like 40 or 50 in a repeated pattern. Is there a specific reason behind this behavior, or should I attribute it to the complexities of HTTP/AJAX technology?

Answer №1

Requests in your example that take around 40ms are actual requests, while others are cached results from the browser.

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