For years, React has been the undisputed king of frontend development. Its Virtual DOM revolutionized how we build UIs. But a new challenger has emerged: SolidJS.
At Boundev, we constantly evaluate new technologies to deliver the fastest possible experiences for our clients. SolidJS promises the component model we love in React, but without the heavy runtime overhead. This guide breaks down the technical differences to help you decide which tool fits your next project.
Head-to-Head Comparison
| Feature | React | SolidJS |
|---|---|---|
| Reactivity Model | Pull-based (Virtual DOM diffing) | Push-based (Fine-grained Signals) |
| Component Rendering | Re-renders on every state change | Renders once (setup function) |
| Bundle Size | ~40KB (Runtime + VDOM) | ~7KB (Compiler + Runtime) |
| Ecosystem Maturity | Extremely High (Standard) | Growing (Niche) |
| Performance | Fast (Optimized VDOM) | Fastest (Direct DOM updates) |
The Core Difference: Virtual DOM vs. Signals
The fundamental difference lies in how they handle updates. React relies on a Virtual DOM—a lightweight copy of the UI kept in memory. When state changes, React compares the new virtual DOM with the old one (diffing) and updates the real DOM.
React's Approach
Update cycle: State Change → Re-run Component Function → Diff Virtual DOM → Patch Real DOM.
// React re-runs this whole function
function Counter() {
const [count, setCount] = useState(0);
return <button>{count}</button>;
}
function Counter() {
const [count, setCount] = useState(0);
return <button>{count}</button>;
}
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<h3 class="font-bold text-indigo-900 mb-3 text-lg">SolidJS's Approach</h3>
<p class="text-gray-700 mb-4 text-sm">Update cycle: State Change → Update <em>only</em> the bound DOM node. Components disappear after setup.</p>
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// Solid runs this once<br>
function Counter() {<br>
const [count, setCount] = createSignal(0);<br>
// Only the text node updates<br>
return <button>{count()}</button>;<br>
}
</div>
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Performance Benchmarks
In the famous JS Framework Benchmark, SolidJS consistently ranks near vanilla JavaScript, leaving React behind in raw rendering speed.
SolidJS (1.07)
Near Native Speed
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Vanilla JS (1.00)
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Baseline
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React (1.71)
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Slower overhead
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<p class="text-xs text-gray-500 mt-2">* Lower score is better. 1.00 is baseline vanilla JS speed.</p>
When to Choose Which?
Use React If...
- ✓ You need a vast ecosystem of third-party libraries (UI components, advanced data fetching).
- ✓ You are hiring for a large team and need to find developers easily.
- ✓ You are building a massive enterprise app where strict architectural patterns (Next.js) are improved.
- ✓ You want the stability of a battle-tested framework supported by Meta.
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<li class="flex items-start gap-2"><span class="text-indigo-500 font-bold">✓</span> Performance is your absolute #1 priority (e.g., real-time dashboards, games).</li>
<li class="flex items-start gap-2"><span class="text-indigo-500 font-bold">✓</span> You want smaller bundle sizes for faster page loads on mobile networks.</li>
<li class="flex items-start gap-2"><span class="text-indigo-500 font-bold">✓</span> You prefer explicit reactivity over React's dependency array nuances.</li>
<li class="flex items-start gap-2"><span class="text-indigo-500 font-bold">✓</span> You enjoy "bleeding edge" tech and don't mind building some custom utilities.</li>
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Frequently Asked Questions
Is SolidJS faster than React?
Yes, benchmarks consistently show SolidJS is faster than React. By skipping the Virtual DOM and updating the DOM directly via fine-grained signals, SolidJS achieves updating speeds 50-70% faster in high-load scenarios.
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<h3 itemprop="name" class="font-bold text-gray-900 mb-2">Can I use React libraries in SolidJS?</h3>
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<p itemprop="text" class="text-gray-600">Directly, no. Because SolidJS uses a different rendering mechanism (no Virtual DOM), React UI components are not compatible. However, logic-only libraries (like Lodash or date-fns) work perfectly in both.</p>
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<h3 itemprop="name" class="font-bold text-gray-900 mb-2">Is SolidJS hard to learn for React developers?</h3>
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<p itemprop="text" class="text-gray-600">Not at all. SolidJS uses JSX and a similar "function component" structure. React developers will feel at home with 80% of the syntax. The main thing to unlearn is how components re-render; in SolidJS, they don't!</p>
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<h3 itemprop="name" class="font-bold text-gray-900 mb-2">What are Signals in SolidJS?</h3>
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<p itemprop="text" class="text-gray-600">Signals are the core unit of reactivity in SolidJS. Unlike React state, which triggers a component re-render, a Signal is an event emitter. When you update a Signal, it notifies only the specific part of the DOM that is listening to it, resulting in surgical updates.</p>
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Need High-Performance Web Apps?
Whether you choose the stability of React or the speed of SolidJS, Boundev's expert developers can build your next project. We specialize in choosing the right tool for your business goals.
Consult with an Expert