· react / solidjs / javascript

React vs SolidJS 2026: Fine-Grained Reactivity Matters

Solid beats React on raw DOM performance — 7× faster on swap operations, 11× smaller bundle. React wins on ecosystem, hiring, and meta-framework maturity.

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1,564 words · 8 min read

Solid is measurably faster than React, and the React Compiler does not change that. If you’re building a data-dense, swap-heavy UI and bundle size is a real constraint, Solid is the better tool. If you’re hiring developers, need a mature component library, or are building server-first, React is still the overwhelming default — and that gap isn’t closing soon.

The choice is cleaner than the ecosystem noise suggests: pick the reactivity model that fits the problem, not the framework with the biggest conference track.

Who this is for

React developers evaluating whether to use SolidJS for a new single-page app in 2026. This comparison has limited signal if you’re building a server-rendered site (Next.js has no peer here), working on a team without Solid expertise, or need an established accessible component library on day one.

What we tested

React Hooks: 19.2.0 (released October 1, 2025)
React Compiler: 1.0 (released October 7, 2025), paired with React 19
SolidJS: 1.9.3 (stable 1.x)

Benchmark data from js-framework-benchmark, webdriver-ts/results.json. All numbers are median total time in milliseconds; lower is better. Machine spec from the benchmark repository. Bundle sizes are the js-framework-benchmark app bundles — not bare npm packages — which is the honest comparison for shipped code.

Reactivity model

React re-runs the component function on every state change and diffs the resulting virtual DOM tree against the previous one. The VDOM reconciler decides what actually changes in the real DOM. That model is predictable and debuggable. It is also structurally expensive for operations that touch many unrelated nodes.

Solid has no virtual DOM. When a signal changes, only the computation that read that signal re-runs — nothing else. Ryan Carniato, Solid’s author, put it precisely: “Whenever the signal is executed the wrapping function detects it and automatically subscribes to it.” No dependency arrays. No stale closures. No re-running the component to discover what changed.

The React Compiler (1.0, stable since October 2025) automates memoization — useMemo and useCallback calls that developers previously wrote by hand. That is genuinely useful. But it does not change what runs. The compiler optimizes memo boundaries; the reconciler still walks the VDOM tree; components still re-execute. The swap row result below is the empirical proof.

Performance benchmarks

Speed

OperationReact Hooks 19.2React Compiler 19Solid 1.9.3
create 1k rows24.0 ms24.0 ms21.6 ms
replace 1k rows30.3 ms30.2 ms24.1 ms
partial update (every 10th row)14.0 ms13.9 ms10.6 ms
select row4.3 ms6.7 ms3.2 ms
swap rows88.8 ms89.9 ms12.7 ms
remove row11.1 ms11.6 ms10.0 ms
create 10k rows411.1 ms447.6 ms234.4 ms
append 1k rows28.9 ms29.7 ms24.5 ms
clear rows16.3 ms16.5 ms10.6 ms

The swap rows number is the story. Swapping two rows means two nodes change position — the rest of the list is untouched. React’s VDOM reconciler still walks the whole list to confirm nothing else changed: 88.8 ms. Solid’s fine-grained subscriptions update only the two affected nodes: 12.7 ms. That is a 7× difference, and the React Compiler makes it fractionally worse (89.9 ms) — a reminder that it is an optimization layer on top of a fundamentally recursive algorithm, not a replacement for it.

For create/append/replace operations the gap is narrower (roughly 1.1–1.8×). For the 10k-row creation, Solid is 1.75× faster — that one matters at load time.

Memory and bundle size

MetricReact Hooks 19.2React Compiler 19Solid 1.9.3
bundle (uncompressed)190.3 KB183 KB11.5 KB
bundle (compressed)51.4 KB50 KB4.5 KB
first paint211.6 ms202 ms36.7 ms
runtime memory4.41 MB4.58 MB2.58 MB

Solid’s compressed bundle is 4.5 KB against React’s 51 KB — an 11× difference. That gap shows up directly in first paint: 36.7 ms vs 211.6 ms. On mobile networks or low-powered devices that is the difference between feeling instant and feeling slow.

Runtime memory is 2.58 MB for Solid vs 4.41 MB for React — a smaller gap, but meaningful in memory-constrained tabs.

Developer experience

Solid’s signal model removes an entire class of bugs. No dependency arrays means no missing dependency lint warnings and no stale closures. Reactivity is automatic — write a computation that reads a signal, and it tracks itself.

The tradeoff is that the JSX in Solid is not a rendering function — it is a build-time template. You cannot conditionally branch in ways that React developers assume are fine:

// React: works
function Item({ active }) {
  return <div className={active ? 'active' : ''}>{active && <span>on</span>}</div>;
}

// Solid: use Show, not &&, for conditional rendering
function Item(props) {
  return (
    <div class={props.active ? 'active' : ''}>
      <Show when={props.active}>
        <span>on</span>
      </Show>
    </div>
  );
}

The learning curve is real. Solid’s primitives (createSignal, createMemo, createEffect) are fewer and more orthogonal than React’s (useState, useReducer, useMemo, useCallback, useEffect, useLayoutEffect, useRef), but they behave differently enough that React muscle memory produces bugs. Plan for two to four weeks before a team is writing Solid idiomatically.

On the React side, the Compiler eliminates the cognitive tax of manual memoization. According to the React Compiler documentation, greenfield projects get a smooth experience, while brownfield codebases often surface long-tolerated Rules-of-React violations that were previously silently ignored. Libraries that rely on direct mutation or MobX-style patterns may need patches or pins.

Ecosystem

React pulls roughly 53× more weekly npm downloads than Solid — 134M vs 2.54M for the week of May 14–20, 2026, per npm trends. That gap translates directly into:

  • UI libraries: Material UI, shadcn/ui, Radix, Headless UI, React Aria, Mantine — mature, accessible, actively maintained. Solid’s options are Kobalte (solid accessibility primitives), Corvu (primitives), and Solid UI (a shadcn port). They are functional but younger.
  • Hiring: job-posting volume is lopsided — ZipRecruiter showed 1,000+ React JS postings against roughly 22 SolidJS postings as of May 2026. That asymmetry matters the moment the team scales.
  • Tooling: React DevTools, Storybook, React Testing Library, dozens of state management libraries. Solid has solid-devtools and a testing library, but the ecosystem breadth is narrower.

For meta-frameworks: Next.js 16.2 is mature, battle-tested, and shipping new features on a regular cadence. SolidStart 1.0 (stable since May 2024) is functional and production-ready, but the community knowledge base — tutorials, Stack Overflow answers, third-party plugin support — is a fraction of Next.js’s. For server-first architecture, this is not a close call.

If Svelte is also on your shortlist as a React alternative, React vs Svelte covers similar performance and DX trade-offs with different numbers. For a head-to-head between the two leading meta-frameworks, see SvelteKit vs Next.js.

Verdict

Pick React if:

  • Your team is hiring and Solid experience is rare in your candidate pool.
  • You need a mature accessible component library from day one (Radix, React Aria, MUI).
  • Server-side rendering or a full-stack meta-framework is the primary use case.
  • The codebase will grow beyond 5 developers — ecosystem depth matters at scale.

Pick Solid if:

  • Raw DOM performance is critical: swap-heavy data tables, high-frequency UI updates, dashboards with many independent cells.
  • Bundle size is a real constraint — mobile web, low-bandwidth environments, or Core Web Vitals pressure.
  • The team is willing to invest two to four weeks in the reactivity model and accept a smaller library catalog.
  • You are starting a greenfield SPA and do not need Next.js-class SSR maturity.

Caveats

React Compiler 1.0 brownfield issues. The compiler enforces the Rules of React that were previously optional. Older libraries that rely on direct mutation or wrap MobX patterns may break silently or at build time. Pin to the exact 1.0.x release; the Babel plugin adds build overhead that becomes perceptible in monorepos with thousands of files.

SolidJS 2.0.0-beta.0 (March 2023). A 2.0 beta is in flight with breaking changes — Index component removed, use: directives removed. Do not use 2.0 for production today. The right target is 1.9.x, which is stable. Plan for a migration if you adopt Solid and want 2.0 features.

What we did not test. Server components, React Server Actions, streaming SSR, and full-stack SolidStart use cases are outside the js-framework-benchmark scope. Those workloads could produce different trade-offs.

References