Margelo

Ever wondered why animations on #reactnative's new architecture were so laggy? We partnered with the @discord team, found the bottlenecks, and helped make their mobile app feel buttery smooth. Here’s the before/after 👇

@mrousavy AWS Device Farm be like:

With end to end testing like this, an LLM/MCP can develop features, fix bugs, or improve performance where it couldn't have done so before - Hardware APIs (like Camera) differ from device to device, so API docs don't tell the full story - our Harness tests now close the gap 💪

Closing the feedback loop makes you a 100x developer nowadays 📈 We set up fully automated tests to run VisionCamera V5 with various input/output/size/FPS/HDR combinations on real iPhones/Android devices via AWS Device Farm 🤯

@milljez nice!

Powered by nitro modules⚡ @margelo_com

Introducing react-native-cover🔒 Stop sensitive data from leaking into the iOS App Switcher and Android Recents. ⚡ Fully native, zero JS overhead 🎨 Solid color, image, or blur 🌗 Light & dark mode 💫 Customizable fade animation

@ChmalSzymon Awesome!

Rozenite v1.8.0 brings react-native-nitro-fetch to React Native DevTools via the Network Activity plugin. You can mix both nitro-fetch and built-in APIs - you'll see both in a unified network log.

@margelo_com You are renderful

@wcandillon 👀

Read the full story here 👇 blog.margelo.com/make-jsi-run-f…

Architectural decisions can make your JSI modules up to 𝟮𝟵𝘅 faster 🤯 - learn how to flatten data structures, use 𝚓𝚜𝚒::𝙰𝚛𝚛𝚊𝚢𝙱𝚞𝚏𝚏𝚎𝚛 & 𝚓𝚜𝚒::𝙼𝚞𝚝𝚊𝚋𝚕𝚎𝙱𝚞𝚏𝚏𝚎𝚛, and improve string building & comparisons in Part 2 of our JSI performance blog post:

@wcandillon 👀

There is just one thing I'll need to share with You before flying to Kraków

A Nitro Module btw!

@eshanbetrabet 🖤

@margelo_com blog is so good

@birch_js Thank you Jamie! 🖤

This is the first and only guide I've ever seen on how to use React Native JSI's NativeState, despite having heard it be recommended over HostObject for years. As usual, it's Margelo working out, from few to zero available examples, how to use these undocumented APIs 👏

@ElwanRami HostObjects can be very dynamic, similar to a JS Proxy object.

@margelo_com Given that HostFunction is faster than HostObject when no state is needed and NativeState is faster than HostObject when state is needed. When would one use HostObject?

Your JSI library might be slower than it needs to be. Small JSI architecture decisions can make code up to 2x–10x faster - we benchmarked what actually matters: - HostFunction vs HostObject - NativeState - Stack vs Heap If you care about performance, read this. 👇

margelo really has infinity stones hidden in plain sight they keep going after the deep, unglamorous parts of the stack, reanimated internals, jsi architecture, memory decisions

@shubhporwal24 🫶

@shubhporwal24 🫡

credit to the people who pushed this through, seriously impressive work. takeways > animation was core infrastructure masquerading as a library problem > when enough people feel the pain, the real fix is often deeper in the stack, not another workaround on top > ecosystems get stuck when shared pain lives too long at the library layer

@SufferingGeorge hired

The real react native tech interview should take only 10 seconds - Can you output this symbol ↔ in 10 seconds? - ↔ - you're hired

@_vim10 🖤

How to Make Pure JSI Code Faster in React Native blog.margelo.com/make-jsi-run-f… via @margelo_com