SolidJS vs React 2026: Performance, DX, and When to Choose Each

React invented modern component-based UI development. SolidJS questioned every assumption React made and rebuilt the model from scratch. In 2026, both are mature, production-ready, and genuinely different in ways that matter.

This is a technical comparison — benchmarks, code patterns, mental models, ecosystem reality, and when each framework makes sense for your next project.

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The Core Philosophical Difference

React and SolidJS solve the same problem — updating the DOM when state changes — with completely different approaches.

React: Virtual DOM

React re-renders components when state changes. It creates a virtual representation of the DOM, diffs it against the previous version, and patches the real DOM.

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

  console.log("Counter rendered"); // Runs on every state change

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

When setCount is called, the Counter function runs again. React diffs the new JSX output with the previous one and updates only the changed DOM node (<p>).

SolidJS: Fine-Grained Reactivity

SolidJS doesn’t re-render components. It compiles JSX to real DOM operations and uses signals — reactive primitives — to update only the specific DOM nodes that depend on changed data.

import { createSignal } from "solid-js";

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

  console.log("Counter rendered"); // Runs ONCE — on initial render

  return (
    <div>
      <p>Count: {count()}</p>  {/* Only this text node updates */}
      <button onClick={() => setCount(count() + 1)}>Increment</button>
    </div>
  );
}

The Counter function runs once. When setCount is called, SolidJS knows exactly which DOM node contains count() and updates only that text node — no diff, no re-render.

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Signals vs useState: The Key Pattern Difference

useState (React)

import { useState, useEffect, useMemo, useCallback } from "react";

function UserProfile({ userId }: { userId: number }) {
  const [user, setUser] = useState<User | null>(null);
  const [loading, setLoading] = useState(true);

  useEffect(() => {
    setLoading(true);
    fetchUser(userId).then(data => {
      setUser(data);
      setLoading(false);
    });
  }, [userId]);  // Must declare dependencies

  const displayName = useMemo(
    () => user ? `${user.firstName} ${user.lastName}` : "Loading...",
    [user]  // Must declare dependencies
  );

  const handleUpdate = useCallback(
    (field: string, value: string) => {
      setUser(prev => prev ? { ...prev, [field]: value } : null);
    },
    []  // Must declare dependencies
  );

  if (loading) return <div>Loading...</div>;
  return <div>{displayName}</div>;
}

createSignal + createEffect (SolidJS)

import { createSignal, createEffect, createMemo, Show } from "solid-js";

function UserProfile(props: { userId: number }) {
  const [user, setUser] = createSignal<User | null>(null);
  const [loading, setLoading] = createSignal(true);

  createEffect(() => {
    // props.userId is automatically tracked — no dependency array needed
    setLoading(true);
    fetchUser(props.userId).then(data => {
      setUser(data);
      setLoading(false);
    });
  });

  const displayName = createMemo(() =>
    user() ? `${user()!.firstName} ${user()!.lastName}` : "Loading..."
  // No dependency array — automatically tracks user()
  );

  return (
    <Show when={!loading()} fallback={<div>Loading...</div>}>
      <div>{displayName()}</div>
    </Show>
  );
}

Key differences:

• SolidJS has no dependency arrays — reactivity is tracked automatically
• Signals are getter functions: count() not count
• SolidJS control flow uses components (<Show>, <For>, <Switch>) rather than JS expressions

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Control Flow Patterns

Lists

// React
function UserList({ users }) {
  return (
    <ul>
      {users.map(user => (
        <li key={user.id}>{user.name}</li>
      ))}
    </ul>
  );
  // Problem: entire list re-renders when any user changes
}

// SolidJS
import { For } from "solid-js";

function UserList(props) {
  return (
    <ul>
      <For each={props.users}>
        {(user) => <li>{user.name}</li>}
      </For>
    </ul>
  );
  // Only the changed item's DOM node updates
}

Conditional Rendering

// React
function Profile({ user, loading }) {
  if (loading) return <Spinner />;
  if (!user) return <NotFound />;
  return <UserCard user={user} />;
}

// SolidJS
import { Show, Switch, Match } from "solid-js";

function Profile(props) {
  return (
    <Switch fallback={<UserCard user={props.user} />}>
      <Match when={props.loading}><Spinner /></Match>
      <Match when={!props.user}><NotFound /></Match>
    </Switch>
  );
}

Async Data

// React (with Suspense)
import { Suspense, use } from "react";

function UserDetails({ userId }) {
  const user = use(fetchUser(userId));  // React 19 'use' hook
  return <div>{user.name}</div>;
}

function App() {
  return (
    <Suspense fallback={<Spinner />}>
      <UserDetails userId={1} />
    </Suspense>
  );
}

// SolidJS
import { createResource, Suspense } from "solid-js";

function UserDetails(props) {
  const [user] = createResource(() => props.userId, fetchUser);

  return (
    <Suspense fallback={<Spinner />}>
      <div>{user()?.name}</div>
    </Suspense>
  );
}

---

Performance Benchmarks

JS Framework Benchmark (2026)

The js-framework-benchmark measures DOM manipulation performance on standardized operations:

Framework	Create 1k rows	Replace 1k rows	Partial update	Select row	Swap rows	Startup score
Vanilla JS	1.00x (base)	1.00x	1.00x	1.00x	1.00x	1.00x
SolidJS	1.07x	1.06x	1.03x	1.05x	1.02x	1.03x
Preact	1.10x	1.08x	1.12x	1.06x	1.07x	1.21x
React 19	1.31x	1.28x	1.24x	1.18x	1.19x	1.42x
Vue 3	1.15x	1.13x	1.09x	1.08x	1.09x	1.30x

Lower = better (multiplier vs vanilla JS). Approximate 2026 values.

SolidJS is consistently within 5–10% of vanilla JavaScript. React is typically 25–40% slower on raw DOM operations.

Real Application Performance

On a real application, the difference is less dramatic:

• For most CRUD apps, data fetching dominates and both frameworks are equivalent
• In data-heavy tables (1000+ rows updating frequently), SolidJS’s advantage is visible
• For initial page load, bundle size matters more than runtime performance

Bundle Size

Framework	Minified + gzipped
SolidJS	~7 KB
Preact	~4 KB
React + ReactDOM	~45 KB
Vue 3	~22 KB

SolidJS ships significantly smaller than React. For low-bandwidth users or PWAs, this matters.

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Developer Experience Comparison

Component Pattern

// React: function + hooks pattern
import { useState, useRef, useEffect } from "react";

interface InputProps {
  label: string;
  value: string;
  onChange: (value: string) => void;
  autoFocus?: boolean;
}

function TextInput({ label, value, onChange, autoFocus = false }: InputProps) {
  const inputRef = useRef<HTMLInputElement>(null);

  useEffect(() => {
    if (autoFocus) {
      inputRef.current?.focus();
    }
  }, [autoFocus]);

  return (
    <label>
      {label}
      <input
        ref={inputRef}
        value={value}
        onInput={(e) => onChange(e.target.value)}
      />
    </label>
  );
}

// SolidJS: similar structure, different reactivity
import { onMount } from "solid-js";

interface InputProps {
  label: string;
  value: string;
  onChange: (value: string) => void;
  autoFocus?: boolean;
}

function TextInput(props: InputProps) {
  let inputRef: HTMLInputElement | undefined;

  onMount(() => {
    if (props.autoFocus) {
      inputRef?.focus();
    }
  });

  return (
    <label>
      {props.label}
      <input
        ref={inputRef}
        value={props.value}
        onInput={(e) => props.onChange(e.currentTarget.value)}
      />
    </label>
  );
}

Props Gotcha: Destructuring

A common SolidJS mistake that React developers make:

// WRONG in SolidJS — destructuring breaks reactivity
function UserCard({ name, email }) {  // ❌ name/email are no longer reactive
  return <div>{name} — {email}</div>;
}

// CORRECT in SolidJS — use props object
function UserCard(props) {
  return <div>{props.name} — {props.email}</div>;
}

// CORRECT with mergeProps for defaults
import { mergeProps } from "solid-js";

function UserCard(rawProps) {
  const props = mergeProps({ role: "user" }, rawProps);
  return <div>{props.name} ({props.role})</div>;
}

In React, destructuring props is fine because components re-render with new values. In SolidJS, props are reactive objects — destructuring them loses the reactivity.

Stores (Complex State)

// React: zustand or Redux
import { create } from "zustand";

const useUserStore = create<UserStore>((set) => ({
  users: [],
  loading: false,
  fetchUsers: async () => {
    set({ loading: true });
    const users = await api.getUsers();
    set({ users, loading: false });
  },
}));

function App() {
  const { users, fetchUsers } = useUserStore();
  // ...
}

// SolidJS: createStore
import { createStore } from "solid-js/store";

const [state, setState] = createStore({
  users: [] as User[],
  loading: false,
});

async function fetchUsers() {
  setState("loading", true);
  const users = await api.getUsers();
  setState({ users, loading: false });
}

// Fine-grained: only components using state.users update
function UserList() {
  return <For each={state.users}>{(user) => <UserItem user={user} />}</For>;
}

---

SolidStart vs Next.js

SolidJS’s meta-framework, SolidStart, competes with Next.js for full-stack applications.

Routing

// Next.js App Router (file-based)
// app/users/[id]/page.tsx
export default async function UserPage({ params }: { params: { id: string } }) {
  const user = await fetchUser(params.id);
  return <UserProfile user={user} />;
}

// SolidStart (file-based)
// src/routes/users/[id].tsx
import { useParams } from "@solidjs/router";
import { createResource } from "solid-js";

export default function UserPage() {
  const params = useParams();
  const [user] = createResource(() => params.id, fetchUser);
  return <UserProfile user={user()} />;
}

Server Actions

// Next.js Server Actions
// actions.ts
"use server";
export async function updateUser(id: string, data: FormData) {
  await db.user.update({ where: { id }, data: Object.fromEntries(data) });
  revalidatePath("/users");
}

// SolidStart Server Functions
import { action, redirect } from "@solidjs/router";

const updateUser = action(async (formData: FormData) => {
  "use server";
  const id = formData.get("id") as string;
  await db.user.update({ where: { id }, data: Object.fromEntries(formData) });
  return redirect("/users");
});

Data Loading

// Next.js — server components fetch on the server by default
async function UsersPage() {
  const users = await db.user.findMany();  // Server-side, no API call
  return <UserList users={users} />;
}

// SolidStart — createServerData$ / load functions
import { createServerData$ } from "solid-start/server";

export function routeData() {
  return createServerData$(() => db.user.findMany());
}

export default function UsersPage() {
  const users = useRouteData<typeof routeData>();
  return <For each={users()}>{(user) => <UserCard user={user} />}</For>;
}

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Ecosystem Maturity

Category	React	SolidJS
Age	2013 (11+ years)	2018 (6 years)
npm downloads/week	~25M	~200K
Component libraries	Hundreds	Growing (Kobalte, SolidUI)
Meta-frameworks	Next.js, Remix, Gatsby	SolidStart
State management	Zustand, Redux, Jotai	Built-in + SolidX
Testing	RTL, Vitest, Playwright	solid-testing-library
Job market	Very strong	Niche/specialized
Community size	Massive	Small but dedicated
Stability	Highly stable	Evolving

React’s ecosystem advantage is substantial. When a problem arises in React, there’s almost always a battle-tested library that solves it. SolidJS’s ecosystem is growing but still immature in many areas.

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Real-World Tradeoffs

When SolidJS makes sense

High-performance dashboards:

// Real-time trading dashboard with 50+ charts updating every 500ms
// SolidJS's fine-grained reactivity means only changed charts re-render
const [prices, setPrices] = createStore<Record<string, number>>({});

// WebSocket price feed
ws.onmessage = (e) => {
  const { symbol, price } = JSON.parse(e.data);
  setPrices(symbol, price);  // Only the specific chart for 'symbol' updates
};

Interactive editors: Rich text editors, code editors, spreadsheet-like UIs — anything with complex state that updates parts of a large tree.

Performance-critical PWAs: 7KB vs 45KB is significant for slow connections.

When React makes sense

Team familiarity: React’s mental model (hooks, re-rendering) is well understood by most frontend developers. SolidJS requires unlearning some React patterns.

Rich ecosystem requirements: If you need react-table, react-query, shadcn/ui, Radix, and your specific library ecosystem — React is the path of least resistance.

Next.js features: Next.js App Router, ISR, Edge Runtime, Server Components, and the Vercel deployment ecosystem are hard to replicate in SolidStart today.

Large team: React’s rules, best practices, and documentation are more mature. Onboarding new developers is easier when the framework has 10+ years of tutorials, courses, and Stack Overflow answers.

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Code Pattern Comparison Table

Pattern	React	SolidJS
Basic state	useState	createSignal
Derived state	useMemo	createMemo
Side effects	useEffect	createEffect
Refs	useRef	let ref; ref={r => ref=r}
Context	createContext + useContext	createContext + useContext
List rendering	array.map()	<For>
Conditional rendering	Ternary / &&	<Show> / <Switch>
Async data	useQuery / Suspense	createResource
Global store	Zustand / Redux	createStore
Component lifecycle	useEffect (mount/unmount)	onMount / onCleanup
Props default values	Destructure with defaults	mergeProps

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Practical Advice for 2026

Starting a new project?

• If you need maximum ecosystem support and team scalability: React + Next.js
• If you’re performance-focused or enjoy exploring better abstractions: SolidJS + SolidStart

Migrating an existing React app? Don’t. The performance gain rarely justifies the migration cost unless you have a specific, measurable performance problem that React’s rendering model causes.

Learning SolidJS as a React developer? Two weeks of focused work will make you productive. The JSX syntax is familiar; the mental model around signals is the main shift. Ryan Carniato’s blog and the SolidJS docs are excellent starting points.

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Developer Tools

• Bundle Size Analyzer — Compare React vs SolidJS bundle sizes for your app
• JavaScript Benchmarks — Run performance tests in your browser
• NPM Compare — Compare download trends for React vs SolidJS packages
• Code Formatter — Format JSX/TSX from either framework

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Summary

SolidJS is technically impressive — its fine-grained reactivity model produces near-vanilla-JS performance, and its signal-based API eliminates most of React’s footguns (stale closures, unnecessary re-renders, dependency arrays).

React wins on ecosystem, team adoption, and the sheer weight of tooling, tutorials, and battle-tested patterns accumulated over a decade.

In 2026, the answer for most teams is still React — not because it’s better, but because the ecosystem advantage is real. SolidJS is the right choice when you specifically need:

• Maximum rendering performance
• Minimal bundle size
• A cleaner reactivity model worth learning

The good news: SolidJS’s ideas are influencing React (signals are being explored for React’s compiler), and the competition makes both frameworks better.