For tracking web app loading performance for single page apps.
Last updated 7 years ago by henrikjoreteg .
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Getting real-world performance metrics from deployed single page webapps is super useful.

You can see how caching strategies affect load times and also make sure you're not causing speed regressions over time. When you're working on localhost or fast internet you may do things that seem like acceptable speed tradeoffs that actually are significantly more impactful for your users who may be on slower connections. By having these metrics reported back from each user you can very quickly get great perspective on how your app is performing for people.

This is a very simple client side module (compatible with clientmodules and browserify) for tracking that load time and the various pieces of it and is designed to be used for reporting back to a metrics service. At &yet we send this as metadata for our "applicationLoaded" event that gets sent to (usually) mixpanel. But which one doesn't really matter, this just tracks the times and reports them.

Here's how it works.

How to use it

Add this bit of vanilla JS to your base HTML as high up in the <head> as you can. To get as accurate of a load start time as possible:

<!DOCTYPE html>
<script>window.times = {start: Date.now()};</script>
<script src="app.js"></script>

Then at various points that you want to track within your app's load sequence, just call recordEvent() with whatever description makes sense for your app:

// require our module
var loadStats = require('loading-stats');

// for example
loadStats.recordEvent('begin launch sequence');

// sometime later you may do...
loadStats.recordEvent('initial data fetched');

// then get your summary and send it off to your
// metrics service. For example
mixpanel.track('web app loaded', loadStats.getSummary());

the .getSummary(); method will return an object
that looks like this. With each event being miliseconds
from the start time we put in our HTML above.

    'ms to begin launch sequence': 100,
    'ms to begin launch sequence': 323,
    'ms to fully loaded': 431

Getting real stats in the wild is awesome



npm i loading-stats

Add it to your clientmodules or user browserify to include it in your app. voila!


If you dig it, follow @HenrikJoreteg on the twitterwebs. If not, file issues or send pull requests :)



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