React Native 0.85 vs Older Versions: Animation Benchmark Comparison
If your app has ever stuttered mid-swipe or dropped frames on a gesture animation, you already know that "60fps on mobile" is more of a promise than a guarantee. React Native 0.85 wants to change that and the benchmarks are telling a pretty interesting story.
Let's be real for a second: animations in older React Native were fine. Not great, not terrible - just fine. You could get smooth motion if you were careful, used useNativeDriver: true, avoided JavaScript-driven layouts, and, you know, crossed your fingers a bit. The problem was that "careful" required a lot of tribal knowledge and a surprising amount of workarounds for something that should feel basic.
React Native 0.85 ships with meaningful changes under the hood, especially around the new architecture (Fabric renderer + JSI + TurboModules becoming more stable) and animations are one of the first places you actually feel it. So let's look at what changed, compare some real numbers, and talk about something that doesn't get mentioned enough: the security implications of pushing animation work off the JS thread.
What actually changed in 0.85?
The headline is the continued rollout of the new React Native architecture. In older versions (pre-0.71 especially), the bridge was the bottleneck. Every animation that touched native views had to marshal data across the JavaScript–native bridge, a serialization step that added latency and was famously prone to jank during heavy JS work.
With 0.85, JSI (JavaScript Interface) is more mature, Fabric is the default renderer for new projects, and Turbo Modules reduce the round-trip cost dramatically. The practical outcome? Animations that previously required carefully isolating work to avoid frame drops now have more headroom.
There's also improved scheduling in the JS runtime - React Native 0.85 adopts a more aggressive approach to prioritizing animation frames using the EventLoop integration, meaning your gesture responders and Animated.spring calls are less likely to get starved by a heavy render cycle.
The benchmark numbers
These figures are drawn from community benchmarks run on a mid-range Android device (Pixel 6a) and an iPhone 13, comparing projects on React Native 0.68, 0.72, and 0.85. The test suite covered list scroll animations, spring gesture interactions, and stacked Animated.parallel sequences.
Test scenario RN 0.68 RN 0.72 RN 0.85
- FlatList scroll (60fps target) 51 avg fps 56 avg fps 59.4 avg fps
- Spring gesture (jank events/sec) 4.1 2.3 0.6
- Parallel animation startup (ms) 38ms 29ms 14ms
- Bridge round-trip cost (µs) ~420µs ~310µs ~80µs (JSI)
- JS thread block during anim. Yes (frequent) Yes (occasional) Rare
The bridge round-trip number is the one worth dwelling on. Going from ~420 microseconds to ~80 microseconds is a 5× reduction and that compounds. If you have a complex screen with multiple animated values updating simultaneously, that overhead is quietly eating into your frame budget every single time.
Average fps under animation load (higher = better)
- RN 0.68 = 51 fps
- RN 0.72 = 56 fps
- RN 0.85 = 59.4 fps
Reanimated 3 plays well too
If you're using Reanimated (and you should be for anything gesture-heavy), the gains in 0.85 amplify further. Reanimated 3 runs worklets entirely on the UI thread, bypassing the JS bridge entirely. On older React Native versions, the interaction between Reanimated's worklet thread and the legacy renderer sometimes caused subtle timing issues during interruptions - a gesture half-complete, then cancelled, could stutter. With Fabric as the underlying renderer in 0.85, those sync points are cleaner, and interrupted animations feel significantly more natural.
QUICK TIP
If you're still on the old architecture with useNativeDriver: true, and hesitant to migrate, the performance delta alone is probably enough to justify the upgrade - especially if your app has any gesture-driven navigation.
The security angle nobody talks about
Here's where it gets interesting. Moving animation logic off the JS thread and closer to the native layer isn't just a performance win, it has real security implications that most React Native devs haven't thought through.
In the old bridge model, animation state (values, interpolations, targets) was constantly being serialized through the bridge as JSON-like payloads. That data in-flight, while technically in-process, was accessible to anything else running in the JS context. In a security-sensitive app, that's worth noting - malicious third-party JS code injected through a compromised dependency could theoretically observe or manipulate animated values that encode sensitive UI state (think: whether a "successful payment" animation is running, visibility states tied to auth flow).
With JSI-based communication and Fabric's synchronous model in 0.85, this exposure window is narrower. Data moves synchronously without the serialization detour, which reduces the surface area for certain classes of timing attacks or observation via bridge interception. It's not a dramatic hardening - but in high-trust applications (fintech, healthcare, authentication flows), the new architecture is the more defensible choice.
SECURITY NOTE
If your app encodes meaningful state in animation variables (e.g., an animated value that only starts when a user is authenticated), audit whether any third-party packages have access to your Animated.Value references. Even on 0.85, JavaScript-scope references remain accessible to code in the same JS bundle.
There's also a supply-chain angle here. The Reanimated worklet system compiles your animation functions into a separate runtime. If an attacker can tamper with your worklet code (via a compromised node_modules package), they could, in theory, run arbitrary code on the UI thread. React Native 0.85's improved module isolation via Turbo Modules gives you better control over what gets loaded and when - but you still need to audit your animation dependencies with the same scrutiny you'd give any native module.
Should you upgrade just for animations?
Honestly? If you're on 0.72 or later and your animations feel acceptable, upgrading for animation performance alone is probably not the urgent priority. The gains are real, but they're incremental for apps not running the new architecture yet.
But if you're still on anything below 0.71, the calculus changes. The bridge overhead in those versions is severe enough that modern gesture-heavy UX patterns (swipe-to-dismiss, physics-based spring interactions, parallax scrolling) will always underperform. You're fighting the architecture rather than working with it.
For new projects? There's no good reason to start below 0.85. The new architecture defaults, the Turbo Module ecosystem, and the Reanimated 3 compatibility make it the right foundation.
The honest summary
React Native has earned a reputation for inconsistent animation quality and some of that reputation was fair. But 0.85 represents a genuine generational shift in the underlying plumbing, and animations are one of the areas where you feel it most directly. The jank events are rarer. The startup cost for complex sequences is down. The bridge no longer feels like a tax you're paying on every frame.
It's not magic. You still need to profile, still need to think about your render cycle, still need to keep heavy JS work off the animation path. But the headroom is significantly wider than it was two years ago and that makes a real difference when you're trying to ship an app that feels native.
TL;DR
React Native 0.85 delivers measurably smoother animations - up to 5× less bridge overhead, dramatically fewer jank events, and better frame scheduling. Combined with Reanimated 3 and the Fabric renderer, it's the best animation story React Native has ever had. Factor in the narrower security surface for sensitive UI state, and the case for upgrading is solid.