BarcelonaJS

Hello everyone! Join us for the next meetup. As always, we will have two talks followed by a networking session.
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Mission: Impossible - Performance Culture
by Andrés Alvarez
Staff Front-End Engineer at Adevinta

Take a journey through our experience of improving web performance at Fotocasa, starting with a directive from top management to boost SEO. At first, it seemed like an impossible mission. Join me as I share the challenges, successes, and lessons learned along the way and learn how we managed to establish a culture focused on performance within the company.

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Last 10 Years of React Performance
by Ivan Akulov
Senior Performance Engineer at Framer, prev. web perf consultant at PerfPerfPerf

From React.createClass to PureComponent to hooks – React has changed a lot. Each of these changes was driven by a desire for better architecture. But under the hood, each of these changes also pushed us to write faster apps – often, without us even noticing that.

In this talk, let’s look at how React’s invisible hand has been making our apps faster over the past 10 years:
- useEffect, and why it’s better than componentDidMount
- Update batching, and how it improved from version 0.4 to 0.12 to 18
- Prepack, which didn’t work out
- Suspense, and some of the less obvious effects of using it
- and more

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IMPORTANT!
Security:

• Access control: The security team requires an attendees list. Make sure you register for the event with your full name. Registration will close 24h before the event.
• You'll be asked to provide your name and ID (DNI, NIE, etc.) to access the building.

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After the talks, we'll have drinks and networking!
Are you interested in giving a talk or have a question? You are welcome to comment or shoot a meetup message to the organizers.
And don't forget to follow us on Twitter for the latest news @BcnJS
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Sponsors:
Adevinta

We are a global digital player and the biggest marketplace specialist in Europe. But we are still a family of local brands – because we believe all great marketplaces are local.

Our marketplaces serve people where they live, acknowledging what’s special about every culture and every place, helping local economies to grow sustainably.