- 2019-01-08 04:32 AM
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- Embrace performance budgets and learn to live within them. For mobile, aim for a JS budget of < 170KB minified/compressed. Uncompressed this is still ~0.7MB of code. Budgets are critical to success, however, they can’t magically fix perf in isolation. Team culture, structure and enforcement matter. Building without a budget invites performance regressions and failure.
The web is bloated by user “experience”
When users access your site you’re probably sending down a lot of files, many of which are scripts. From a web browsers’ perspective this looks a little bit like this:
A large factor of this is how long it takes to download code on a mobile network and then process it on a mobile CPU.
Let’s look at mobile networks.
This chart from OpenSignal shows how consistently 4G networks are globally available and the average connection speed users in each country experience. As we can see, many countries still experience lower connection speeds than we may think.
Not only can that 350 KB of script for a median website from earlier take a while to download, the reality is if we look at popular sites, they actually ship down a lot more script than this:
Sites today will often send the following in their JS bundles:
- A client-side framework or UI library
- A state management solution (e.g. Redux)
- Polyfills (often for modern browsers that don’t need them)
- Full libraries vs. only what they use (e.g. all of lodash, Moment + locales)
- A suite of UI components (buttons, headers, sidebars etc.)
This code adds up. The more there is, the longer it will take for a page to load.
Loading a web page is like a film strip that has three key moments.
There’s: Is it happening? Is it useful? And, is it usable?
Is it happening is the moment you’re able to deliver some content to the screen. (has the navigation started? has the server started responding?)
Is it useful is the moment when you’ve painted text or content that allows the user to derive value from the experience and engage with it.
And then is it usable is the moment when a user can start meaningfully interacting with the experience and have something happen.
I mentioned this term “‘interactive” earlier, but what does that mean?
Whether a user clicks on a link, or scrolls through a page, they need to see that something is actually happening in response to their actions. An experience that can’t deliver on this will frustrate your users.
When a browser runs many of the events you’re probably going to need, it’s likely going to do it on the same thread that handles user input. This thread is called the main thread.