Opher Vishnia @ ReactNext '25 | Quick Wins to Improve Your App’s Performance

ReactNext 2025
www.react-next.com
Brought to you by EventHandler (www.eventhandler.co.il)

Your React app is slow, and, yes, it’s kind of your fault. But don’t worry - you didn’t sabotage it all at once. You’re not in this alone though. To crack this case, we’ve invited some of the world’s greatest detectives to help uncover the culprits behind your app’s sluggish behavior.
React makes it all too easy to unknowingly sabotage performance, with sneaky pitfalls like over-rendered components, re-created references, and sneaky state updates lurking in your code. These issues are elusive and often invisible to the untrained eye - until your app grinds to a halt.
In this session, you’ll think like a detective, learning how to spot red flags, interrogate your codebase, and identify common causes of performance woes. With tools, methodologies, and actionable strategies at your disposal, you’ll solve the mystery of what’s slowing down your React app. Whether you’re an experienced developer or just getting started with React, you’ll walk away with practical techniques to stop sabotaging your app’s performance - and maybe even your sanity.

Opher is a multidisciplinary creator, with expertise spanning web development, design, music, and game development.

He currently leads development as principal engineer at Hud.io, imbuing magic into the field of development tools and observability. Previously, as director of technical innovation and creative developer at Eko, Opher worked at the intersection of art and technology, collaborating with development teams as well as design, art, and film-making teams to redefine interactive media on the web. His notable work includes open source projects like react-animation-orchestrator, Lance JS multiplayer server and the VR film Broken Night, which was showcased at the Cannes Film Festival and Tribeca Film Festival in NYC.