Every React developer hits the same wall eventually: re-renders. SolidJS removes that wall entirely, but at the cost of ecosystem maturity. Here's how to decide between them without burning weeks on the wrong choice.
The SolidJS vs React debate isn't about syntax — both use JSX and components. It's about how they handle reactivity under the hood, and that difference determines everything from performance ceilings to debugging experience.
SolidJS vs React: The Key Differences
React re-runs entire component functions when state changes. SolidJS compiles your components into fine-grained reactive graphs where only the exact DOM nodes that depend on changed data update.
Here's the practical difference:
// React — this whole component re-runs on count change
function Counter() {
const [count, setCount] = useState(0);
console.log("Component re-rendering");
return (
<button onClick={() => setCount(count + 1)}>
Count: {count}
</button>
);
}
// SolidJS — only the text node updates
function Counter() {
const [count, setCount] = createSignal(0);
console.log("Component runs once");
return (
<button onClick={() => setCount(count + 1)}>
Count: {count()}
</button>
);
}
Open your console in React — every click logs. In SolidJS, it logs once. That's not a micro-optimization; it's a fundamentally different execution model. React uses a virtual DOM diff. SolidJS tracks dependencies at the signal level and updates the real DOM directly.
The second major difference: derived state. React needs useMemo to avoid recomputing expensive derived values. SolidJS computes derived signals lazily by default — you just call a function.
// SolidJS — derived value auto-tracks dependencies
const [items, setItems] = createSignal([]);
const totalPrice = createMemo(() =>
items().reduce((sum, item) => sum + item.price, 0)
);
No dependency arrays. No stale closures. The compiler handles it.
When to Use SolidJS
Choose SolidJS when you're building interactive dashboards, real-time data visualizations, or anything with high-frequency updates. If you're rendering thousands of rows that update every second — think trading charts, live monitoring tools, collaborative editors — SolidJS gives you React-like developer experience with vanilla-JS-level performance.
SolidJS also shines in component libraries. Because components only run once, you avoid the "why is this re-rendering?" debugging nightmare. You can ship a library knowing consumers won't accidentally trigger cascading re-renders with bad memoization.
If you're starting a greenfield project with no legacy React code, SolidJS is a serious contender — especially if your team already understands reactive programming (like Vue or Svelte developers).
When to Use React
React remains the safe choice when you need ecosystem depth. If your project depends on established libraries — think rich text editors, complex data grids, or mature charting libraries — React's ecosystem is unmatched. Most of these libraries either lack SolidJS support or have immature wrappers.
React is also the answer when you're hiring or growing a team. The talent pool is massive. Every junior dev knows React. You'll find answers to any React problem within minutes on Stack Overflow. SolidJS questions often require reading source code or digging through GitHub issues.
Stick with React if you're building a large enterprise application with many contributors. The predictable render cycle — even if inefficient — is easier to reason about for developers who don't think in reactive terms. SolidJS's fine-grained reactivity is powerful but requires a mental model shift.
SolidJS or React: Which One Should You Pick?
Pick SolidJS if your core bottleneck is runtime performance and you control the entire stack. Pick React if your bottleneck is team velocity, library availability, or hiring.
The real answer depends on one question: What's your risk tolerance? If you can absorb the learning curve and potential library gaps, SolidJS's performance advantage is real. If you need to ship reliably with existing team skills, React wins.
Neither choice is wrong — they're just different tradeoffs. SolidJS trades ecosystem for performance. React trades performance for ecosystem.
My Take
I've built production apps in both. For new projects where I control the dependencies and performance matters — I pick SolidJS. The developer experience is actually better once you grasp signals. No useCallback, no useMemo, no stale closure bugs. The compiler catches more issues than React's runtime ever will.
But I'd never migrate an existing React codebase to SolidJS. The cost isn't worth it. And if a client brings a React team and asks for a dashboard — I give them React. The performance difference isn't worth fighting the team's muscle memory.
The one thing that makes this decision obvious: If you think in terms of "which parts of my UI depend on this data?" then SolidJS matches your mental model. If you think in terms of "which components should re-render?" then React is your language. That question alone tells you which framework you'll actually enjoy using.