#### article
## Mitigate the performance impact of live chat
In his article, Calibre’s platform developer, [Michael Dijkstra](https://twitter.com/micdijkstra) describes how to mitigate the high performance cost of using live chat tools on your sites. With his open source component, [react live chat loader](https://github.com/calibreapp/react-live-chat-loader), you’ll be able to significantly improve Lighthouse Performance Score and Time to Interactive.
[]()[How we improved the performance of our live chat by 30% →](https://calibreapp.com/blog/fast-live-chat)
#### tools
## Make your interfaces fast with data refetching
SWR (stale while revalidate) is a React Hooks library for remote data fetching that helps with making interfaces feel fast and responsive. Thanks to folks at [Zeit](https://twitter.com/zeithq), you can manage updating data in the background, without disrupting the user experience.
[]()[SWR: React Hooks for Remote Data Fetching →](https://swr.now.sh/)
#### case study
## How Discord sped up their app load by 2 seconds
In this excellent case study, [Miguel Gaeta](https://twitter.com/mrkcsc) explains how Discord implemented a range of optimisations to their React Native iOS app, proving that no amount of milliseconds dropped is worthless. Focusing on battery life and providing a 60fps experience on older iPhones (5, 6 and XS) the article features quite a handful of actionable strategies.
[]()[How Discord achieves native iOS performance with React Native →](https://blog.discordapp.com/how-discord-achieves-native-ios-performance-with-react-native-390c84dcd502)
#### article
## Effectively manage third party JavaScript
[Jeremy Wagner](https://jeremy.codes/) is back with his Responsible JavaScript series. This time, he focuses on one of the biggest offenders nowadays—third party code, providing actionable strategies to prevent performance regressions and manage external tools in the long run.
[]()[Responsible JavaScript: Part III →](https://alistapart.com/article/responsible-javascript-part-3/)
#### talk
## Learn the ins and outs of performance monitoring
In her talk, [Annie Sullivan](https://twitter.com/anniesullie) describes what characterises useful performance metrics and explains when performance monitoring is effective. A goldmine of performance knowledge, usually only known to the few working on tooling.
[]()[Lessons learned from performance monitoring in Chrome →](https://www.slideshare.net/AnnieSullivan9/monitoring-and-metrics-in-chrome-196438420)
#### article
## What speed technologies to watch for in 2020
[Simon Hearne](https://twitter.com/SimonHearne) offers a high-level overview of what technologies are likely to change the face of performance in the upcoming year. It’s important to remember the context of not only the devices we access the Web from but also slow adoption of fast networks like 5G.
[]()[Six Web Performance Technologies to Watch in 2020 →](https://simonhearne.com/2019/2020-predictions/)
