For years, React has been the industry standard. I’ve spent a huge portion of my career building complex dashboards and SaaS tools with it, and it’s an incredible tool. But lately, I’ve been asking myself: why use SolidJS instead of React for new projects in 2026? After migrating a few performance-critical modules to Solid, the answer became clear: it’s not just about speed; it’s about how the framework thinks about data.

The Fundamentals: Reactivity vs. Re-rendering

To understand the difference, we have to look at the core engine. React uses a Virtual DOM (VDOM). When state changes, React re-runs your entire component function, creates a new VDOM tree, compares it with the old one (diffing), and then updates the browser. While efficient for most, this process is fundamentally overhead.

SolidJS takes a completely different approach. It uses fine-grained reactivity. In Solid, your component function runs exactly once. It sets up the reactive graph and then disappears. When a piece of state changes, Solid updates only the specific DOM node tied to that state. There is no diffing, no VDOM, and no unnecessary re-executions of your logic.

Deep Dive: The Three Pillars of SolidJS

1. Signals: The Heart of the Framework

In React, you use useState. In Solid, you use createSignal. At first glance, they look identical, but their behavior is worlds apart. A React state update triggers a component re-render. A Solid signal is a getter/setter pair that tells the framework exactly which part of the HTML needs to change.


// SolidJS Example
import { createSignal } from "solid-js";

function Counter() {
  const [count, setCount] = createSignal(0);

  console.log("This only logs ONCE!"); 

  return (
    <button onClick={() => setCount(count() + 1)}>
      Count is: {count()}
    </button>
  );
}

2. No More Hook Rules

One of my biggest frustrations with React is the “Rules of Hooks.” You can’t call hooks inside loops or conditionals. Because Solid components only run once, these restrictions vanish. You can put a signal inside an if statement or a for loop without the app crashing or losing state sync. This leads to a much more natural development experience.

3. Performance and Bundle Size

Because Solid compiles away most of its framework overhead, the resulting bundles are significantly smaller than React’s. When comparing SvelteKit vs SolidJS for performance, it’s evident that the “no-VDOM” approach is the gold standard for low-latency interfaces.

As shown in the benchmark data below, the gap becomes glaringly obvious when handling high-frequency updates, like real-time data feeds or complex animations.

Performance benchmark chart comparing SolidJS and React DOM manipulation speeds
Performance benchmark chart comparing SolidJS and React DOM manipulation speeds

Implementation: Transitioning Your Mindset

If you’re coming from React, the transition is surprisingly smooth because Solid uses JSX. However, you must stop thinking in terms of “renders.” In Solid, you aren’t writing a function that returns a UI; you’re writing a setup script that configures a UI.

Pro Tip: Avoid destructuring your props in Solid. If you do const { name } = props;, you break reactivity because you’re accessing the value at setup time rather than tracking it through the proxy. Always use props.name in your JSX.

Principles of Choice: When to Switch?

I don’t believe in “best” frameworks, only the “right tool for the job.” If you are building a massive enterprise app where ecosystem size and hiring speed are the priority, React is still the king. It’s a staple in the top frontend frameworks for 2026 for a reason.

However, you should choose SolidJS when:

Tools and Ecosystem

Solid has grown rapidly. With SolidStart, you now have a full-stack meta-framework that competes directly with Next.js, offering server-side rendering (SSR) and hydration with a fraction of the client-side weight.

I’ve found that while the library ecosystem is smaller than React’s, most standard JS libraries work perfectly since Solid doesn’t rely on a proprietary state management loop to function.