But you didn’t need me to tell you that.
So what exactly is this baseline performance cost, this X? Glad you asked! With a free afternoon ahead and a Redmi 6A lying around, it was time to run some numbers using React, Vue, and Angular.
Here’s chalking out how the benchmark results you’ll see below came to be:
- Initialized new React, Vue, and Angular projects using create-react-app, Vue CLI, and Angular CLI, and didn't make any changes to the projects generated by these tools.
- Deployed all three projects to Netlify. Here are the pages: React, Vue, Angular.
- Connected a Xiaomi Redmi 6A to a computer and ran a profile on all three pages using the Chrome DevTools.
The routing and data management libraries used for each project were:
react-router and redux for React, vue-router and vuex for Vue, and the
built-in Angular router and ngrx for Angular.
Upon having run the benchmarks, two numbers seemed interesting:
At the time of writing, the Redmi 6A is a pretty new device, and most Indian users are still using the older Redmi 5A with a slower CPU.
Here are the numbers, starting with the bundle sizes for each application.
While it takes a respectable 200 milliseconds for Chrome to parse and evaluate the React and Vue bundles, it takes over half a second to evaluate the Angular bundle. That’s a large enough interval for your users to notice, and can really cut into your performance budget.
Unsurprisingly, the React and Vue bundles are downloaded in under a second, but the Angular bundle takes over 2 seconds to download.
What’s important here is not how large or small the numbers are, or the relative performance of the three frameworks compared to each other. What’s noteworthy is the fact that your React application will never load faster than about 1.1 seconds on an average phone in India, no matter how much you optimize it. Your Angular app will always take at least 2.7 seconds to boot up. The users of your Vue app will need to wait at least 1 second before they can start using it.
This is when we haven’t even started looking at some of the other essential libraries that most projects end up using. This includes polyfills, form management libraries, date and time libraries, utility libraries such as lodash, drag and drop libraries, charting libraries, etc.
If you want your application to become interactive on your users’ devices in under 5 seconds, can you afford to spend a fifth of that time just booting up React?
Are Frameworks Evil?
We're not advocating that frameworks are evil, or that you should write all your applications in VanillaJS. That would waste far too much productive developer time, and the result will probably end up performing badly at runtime. Frameworks exist for a reason.
But it’s important to consider your audience. If you’re building for
resource constrained devices — which you certainly are if your product
targets a country like India — you could consider using a lighter
framework such as Riot or Preact. Your users will thank you.
In the end, it’s important to strike a balance between developer productivity and user experience. The answer will vary from project to project, so don’t take anyone’s advice as gospel. Build for your own audience, not somebody else’s. Run benchmarks on devices that represent real-world scenarios, and then decide what technologies make sense for you.