How to calculate approximately the connection speed of a website using JavaScript? - Stack Overflow

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How to calculate approximately the connection speed of a website using JavaScript?

I want to create a javascript widget like, which will calculate the speed opening the current opened page.

I am asking if this can be done using just javascript and what will be the idea.

Update

Note that the page size is always Unknown.

How to calculate approximately the connection speed of a website using JavaScript?

I want to create a javascript widget like, which will calculate the speed opening the current opened page.

I am asking if this can be done using just javascript and what will be the idea.

Update

Note that the page size is always Unknown.

• javascript
• connection
• widget

Share Improve this question Follow edited May 20, 2009 at 19:57 Amr Elgarhy asked May 20, 2009 at 17:51 Amr ElgarhyAmr Elgarhy 69.1k7070 gold badges192192 silver badges310310 bronze badges

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2 Answers 2

Sorted by: Reset to default 11

Here's an example using AJAX with .Net backend, though it could be anything.

Here's a simpler example using an image.

The key is to have a page/object of a known size and capture the start and end times as the browser retrieves it. Then simply divide the size by some [unit of time] to get [size] per [unit of time]. Then use math to translate this into whatever you want.

Sure.

<script>
    startTime = Date.now();
    window.onload = function(){
        endTime = Date.now();
        //Time in ms between opening page, and loading all the date
        alert(endTime - startTime)
    };
</script>

Now to approximate speed. Statically you know let's say page is 200kb.

var kbps = 200 / (endTime - startTime * 1000);

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