diff --git a/benchmarks/_util/index.js b/benchmarks/_util/index.js
index 75f903530ca..4b14d843c35 100644
--- a/benchmarks/_util/index.js
+++ b/benchmarks/_util/index.js
@@ -50,4 +50,20 @@ function printResults (results) {
   return console.table(rows)
 }
 
-module.exports = { makeParallelRequests, printResults }
+/**
+ * @param {number} num
+ * @returns {string}
+ */
+function formatBytes (num) {
+  if (!Number.isFinite(num)) {
+    throw new Error('invalid number')
+  }
+
+  const prefixes = ['B', 'KiB', 'MiB', 'GiB', 'TiB', 'PiB']
+
+  const idx = Math.min(Math.floor(Math.log(num) / Math.log(1024)), prefixes.length - 1)
+
+  return `${(num / Math.pow(1024, idx)).toFixed(2)}${prefixes[idx]}`
+}
+
+module.exports = { makeParallelRequests, printResults, formatBytes }
diff --git a/benchmarks/_util/runner.js b/benchmarks/_util/runner.js
new file mode 100644
index 00000000000..ac35dbd3baf
--- /dev/null
+++ b/benchmarks/_util/runner.js
@@ -0,0 +1,140 @@
+// @ts-check
+
+'use strict'
+
+class Info {
+  /** @type {string} */
+  #name
+  /** @type {bigint} */
+  #current
+  /** @type {bigint} */
+  #finish
+  /** @type {(...args: any[]) => any} */
+  #callback
+  /** @type {boolean} */
+  #finalized = false
+
+  /**
+   * @param {string} name
+   * @param {(...args: any[]) => any} callback
+   */
+  constructor (name, callback) {
+    this.#name = name
+    this.#callback = callback
+  }
+
+  get name () {
+    return this.#name
+  }
+
+  start () {
+    if (this.#finalized) {
+      throw new TypeError('called after finished.')
+    }
+    this.#current = process.hrtime.bigint()
+  }
+
+  end () {
+    if (this.#finalized) {
+      throw new TypeError('called after finished.')
+    }
+    this.#finish = process.hrtime.bigint()
+    this.#finalized = true
+    this.#callback()
+  }
+
+  diff () {
+    return Number(this.#finish - this.#current)
+  }
+}
+
+/**
+ * @typedef BenchMarkHandler
+ * @type {(ev: { name: string; start(): void; end(): void; }) => any}
+ */
+
+/**
+ * @param {Record<string, BenchMarkHandler>} experiments
+ * @param {{ minSamples?: number }} [options]
+ * @returns {Promise<{ name: string; average: number; samples: number; fn: BenchMarkHandler; min: number; max: number }[]>}
+ */
+async function bench (experiments, options = {}) {
+  const names = Object.keys(experiments)
+
+  /** @type {{ name: string; average: number; samples: number; fn: BenchMarkHandler; min: number; max: number }[]} */
+  const results = []
+
+  async function waitMaybePromiseLike (p) {
+    if (
+      (typeof p === 'object' || typeof p === 'function') &&
+      p !== null &&
+      typeof p.then === 'function'
+    ) {
+      await p
+    }
+  }
+
+  for (let i = 0; i < names.length; ++i) {
+    const name = names[i]
+    const fn = experiments[name]
+    const samples = []
+
+    for (let i = 0; i < 8; ++i) {
+      // warmup
+      await new Promise((resolve, reject) => {
+        const info = new Info(name, resolve)
+
+        try {
+          const p = fn(info)
+
+          waitMaybePromiseLike(p).catch((err) => reject(err))
+        } catch (err) {
+          reject(err)
+        }
+      })
+    }
+
+    let timing = 0
+    const minSamples = options.minSamples ?? 128
+
+    for (let j = 0; j < minSamples || timing < 800_000_000; ++j) {
+      let resolve = (value) => {}
+      let reject = (reason) => {}
+      const promise = new Promise(
+        (_resolve, _reject) => { resolve = _resolve; reject = _reject }
+      )
+
+      const info = new Info(name, resolve)
+
+      try {
+        const p = fn(info)
+
+        await waitMaybePromiseLike(p)
+      } catch (err) {
+        reject(err)
+      }
+
+      await promise
+
+      samples.push({ time: info.diff() })
+
+      timing += info.diff()
+    }
+
+    const average =
+      samples.map((v) => v.time).reduce((a, b) => a + b, 0) / samples.length
+
+    results.push({
+      name: names[i],
+      average,
+      samples: samples.length,
+      fn,
+      min: samples.reduce((a, acc) => Math.min(a, acc.time), samples[0].time),
+      max: samples.reduce((a, acc) => Math.max(a, acc.time), samples[0].time)
+    })
+  }
+
+  return results
+}
+
+module.exports = { bench }
diff --git a/benchmarks/package.json b/benchmarks/package.json
index c864c56b3ea..2e65101df6f 100644
--- a/benchmarks/package.json
+++ b/benchmarks/package.json
@@ -21,6 +21,7 @@
     "node-fetch": "^3.3.2",
     "request": "^2.88.2",
     "superagent": "^10.0.0",
-    "wait-on": "^8.0.0"
+    "wait-on": "^8.0.0",
+    "uWebSockets.js": "uNetworking/uWebSockets.js#v20.49.0"
   }
 }
diff --git a/benchmarks/websocket-benchmark.mjs b/benchmarks/websocket-benchmark.mjs
new file mode 100644
index 00000000000..6ffff3cc003
--- /dev/null
+++ b/benchmarks/websocket-benchmark.mjs
@@ -0,0 +1,208 @@
+// @ts-check
+
+import { bench } from './_util/runner.js'
+import { formatBytes } from './_util/index.js'
+import { WebSocket, WebSocketStream } from '../index.js'
+import { WebSocket as WsWebSocket } from 'ws'
+
+/**
+ * @type {Record<string, { fn: (ws: any, binary: string | Uint8Array) => import('./_util/runner.js').BenchMarkHandler; connect: (url: string) => Promise<any>; binaries: (string | Uint8Array)[] }>}
+ */
+const experiments = {}
+/**
+ * @type {Record<string, { bytes: number; binaryType: 'string' | 'binary' }>}
+ */
+const experimentsInfo = {}
+
+/**
+ * @type {any[]}
+ */
+const connections = []
+
+const binary = Buffer.alloc(1024 * 256, '_')
+const binaries = [binary, binary.toString('utf-8')]
+
+experiments['undici'] = {
+  fn: (ws, binary) => {
+    if (!(ws instanceof WebSocket)) {
+      throw new Error("'undici' websocket are expected.")
+    }
+
+    return (ev) => {
+      ws.addEventListener(
+        'message',
+        () => {
+          ev.end()
+        },
+        { once: true }
+      )
+
+      ev.start()
+      ws.send(binary)
+    }
+  },
+
+  connect: async (url) => {
+    const ws = new WebSocket(url)
+
+    await /** @type {Promise<void>} */ (
+      new Promise((resolve, reject) => {
+        function onOpen () {
+          resolve()
+          ws.removeEventListener('open', onOpen)
+          ws.removeEventListener('error', onError)
+        }
+        function onError (err) {
+          reject(err)
+          ws.removeEventListener('open', onOpen)
+          ws.removeEventListener('error', onError)
+        }
+        ws.addEventListener('open', onOpen)
+        ws.addEventListener('error', onError)
+      })
+    )
+
+    // avoid create blob
+    ws.binaryType = 'arraybuffer'
+
+    return ws
+  },
+
+  binaries
+}
+
+experiments['undici - stream'] = {
+  fn: (ws, binary) => {
+    /** @type {ReadableStreamDefaultReader<string | Uint8Array>} */
+    const reader = ws.reader
+    /** @type {WritableStreamDefaultWriter<string | BufferSource>} */
+    const writer = ws.writer
+
+    return async (ev) => {
+      ev.start()
+      await writer.write(binary)
+      await reader.read()
+      ev.end()
+    }
+  },
+
+  connect: async (url) => {
+    const ws = new WebSocketStream(url)
+
+    const { readable, writable } = await ws.opened
+    const reader = readable.getReader()
+    const writer = writable.getWriter()
+
+    // @ts-ignore
+    return { reader, writer, close: () => ws.close() }
+  },
+
+  binaries
+}
+
+experiments['ws'] = {
+  fn: (ws, binary) => {
+    if (!(ws instanceof WsWebSocket)) {
+      throw new Error("'ws' websocket are expected.")
+    }
+
+    return (ev) => {
+      ws.once('message', () => {
+        ev.end()
+      })
+      ev.start()
+      ws.send(binary)
+    }
+  },
+
+  connect: async (url) => {
+    const ws = new WsWebSocket(url)
+
+    await /** @type {Promise<void>} */ (
+      new Promise((resolve, reject) => {
+        function onOpen () {
+          resolve()
+          ws.off('open', onOpen)
+          ws.off('error', onError)
+        }
+        function onError (err) {
+          reject(err)
+          ws.off('open', onOpen)
+          ws.off('error', onError)
+        }
+        ws.on('open', onOpen)
+        ws.on('error', onError)
+      })
+    )
+
+    ws.binaryType = 'arraybuffer'
+
+    return ws
+  },
+
+  binaries
+}
+
+async function init () {
+  /** @type {Record<string, import('./_util/runner.js').BenchMarkHandler>} */
+  const round = {}
+
+  const keys = Object.keys(experiments)
+
+  for (let i = 0; i < keys.length; ++i) {
+    const name = keys[i]
+
+    const { fn, connect, binaries } = experiments[name]
+
+    const ws = await connect('ws://localhost:5001')
+
+    const needShowBytes = binaries.length !== 2 || typeof binaries[0] === typeof binaries[1]
+    for (let i = 0; i < binaries.length; ++i) {
+      const binary = binaries[i]
+      const bytes = Buffer.byteLength(binary)
+
+      const binaryType = typeof binary === 'string' ? 'string' : 'binary'
+      const roundName = needShowBytes
+        ? `${name} [${formatBytes(bytes)} (${binaryType})]`
+        : `${name} [${binaryType}]`
+
+      round[roundName] = fn(ws, binary)
+      experimentsInfo[roundName] = { bytes, binaryType }
+    }
+
+    connections.push(ws)
+  }
+
+  return round
+}
+
+init()
+  .then((round) => bench(round, {
+    minSamples: 512
+  }))
+  .then((results) => {
+    print(results)
+
+    for (const ws of connections) {
+      ws.close()
+    }
+  }, (err) => {
+    process.nextTick((err) => {
+      throw err
+    }, err)
+  })
+
+/**
+ * @param {{ name: string; average: number; }[]} results
+ */
+function print (results) {
+  for (const { name, average } of results) {
+    const { bytes } = experimentsInfo[name]
+
+    console.log(
+      `${name}: transferred ${formatBytes((bytes / average) * 1e9)} Bytes/s`
+    )
+  }
+}
+
+export {}
diff --git a/benchmarks/websocket-echo-server.mjs b/benchmarks/websocket-echo-server.mjs
new file mode 100644
index 00000000000..c4267ce05af
--- /dev/null
+++ b/benchmarks/websocket-echo-server.mjs
@@ -0,0 +1,46 @@
+import { Worker, isMainThread, parentPort, threadId } from 'node:worker_threads'
+import { cpus } from 'node:os'
+import url from 'node:url'
+import uws from 'uWebSockets.js'
+
+const __filename = url.fileURLToPath(import.meta.url)
+
+const app = uws.App()
+
+if (isMainThread) {
+  for (let i = cpus().length - 1; i >= 0; --i) {
+    new Worker(__filename).on('message', (workerAppDescriptor) => {
+      app.addChildAppDescriptor(workerAppDescriptor)
+    })
+  }
+} else {
+  app
+    .ws('/*', {
+      compression: uws.DISABLED,
+      maxPayloadLength: 512 * 1024 * 1024,
+      maxBackpressure: 128 * 1024,
+      idleTimeout: 60,
+      message: (ws, message, isBinary) => {
+        /* Here we echo the message back, using compression if available */
+        const ok = ws.send(message, isBinary) // eslint-disable-line
+      }
+    })
+    .get('/*', (res, req) => {
+      /* It does Http as well */
+      res
+        .writeStatus('200 OK')
+        .end('Hello there!')
+    })
+
+  parentPort.postMessage(app.getDescriptor())
+}
+
+app.listen(5001, (listenSocket) => {
+  if (listenSocket) {
+    if (threadId === 0) {
+      console.log('Listening to port 5001')
+    } else {
+      console.log(`Listening to port 5001 from thread ${threadId}`)
+    }
+  }
+})
diff --git a/benchmarks/websocket/generate-mask.mjs b/benchmarks/websocket/generate-mask.mjs
index 032f05d8b99..8562b828b28 100644
--- a/benchmarks/websocket/generate-mask.mjs
+++ b/benchmarks/websocket/generate-mask.mjs
@@ -1,7 +1,7 @@
 import { randomFillSync, randomBytes } from 'node:crypto'
 import { bench, group, run } from 'mitata'
 
-const BUFFER_SIZE = 16384
+const BUFFER_SIZE = 8 * 1024
 
 const buf = Buffer.allocUnsafe(BUFFER_SIZE)
 let bufIdx = BUFFER_SIZE
diff --git a/benchmarks/websocket/websocket-buffer.mjs b/benchmarks/websocket/websocket-buffer.mjs
new file mode 100644
index 00000000000..c012a7a9e54
--- /dev/null
+++ b/benchmarks/websocket/websocket-buffer.mjs
@@ -0,0 +1,75 @@
+import { WebSocket as WsWebSocket } from 'ws'
+import { WebSocket as UndiciWebSocket } from '../../index.js'
+import { bench, run, lineplot } from 'mitata'
+
+const __BINARY_SIZE__ = 1024 * 512
+
+const binary = Buffer.alloc(__BINARY_SIZE__, '_')
+
+const url = 'http://localhost:5001'
+
+const connections = []
+
+lineplot(() => {
+  {
+    const ws = new WsWebSocket(url)
+    let _resolve
+    ws.on('message', () => {
+      _resolve()
+    })
+    bench('ws ($messages)', function * (state) {
+      const messages = state.get('messages')
+      const chunk = binary.subarray(0, __BINARY_SIZE__ / messages)
+      yield () => new Promise((resolve, reject) => {
+        for (let i = 0; i < messages; ++i) ws.send(chunk)
+        let id = 0
+        _resolve = () => {
+          if (++id === messages) {
+            resolve()
+          }
+        }
+      })
+    }).range('messages', 1, 256)
+    connections.push(ws)
+  }
+  {
+    const ws = new UndiciWebSocket(url)
+    let _resolve
+    ws.addEventListener('message', () => {
+      _resolve()
+    })
+    bench('undici ($messages)', function * (state) {
+      const messages = state.get('messages')
+      const chunk = binary.subarray(0, __BINARY_SIZE__ / messages)
+      yield () => new Promise((resolve, reject) => {
+        for (let i = 0; i < messages; ++i) ws.send(chunk)
+        let id = 0
+        _resolve = () => {
+          if (++id === messages) {
+            resolve()
+          }
+        }
+      })
+    }).range('messages', 1, 256)
+    connections.push(ws)
+  }
+})
+
+for (const ws of connections) {
+  // for fairness
+  ws.binaryType = 'arraybuffer'
+  await new Promise((resolve, reject) => {
+    ws.addEventListener('open', () => {
+      resolve()
+    })
+    ws.addEventListener('error', (err) => {
+      reject(err)
+    })
+  })
+}
+
+await run()
+
+for (const ws of connections) {
+  ws.close()
+}
diff --git a/benchmarks/websocket/websocket-string.mjs b/benchmarks/websocket/websocket-string.mjs
new file mode 100644
index 00000000000..8dc251637da
--- /dev/null
+++ b/benchmarks/websocket/websocket-string.mjs
@@ -0,0 +1,75 @@
+import { WebSocket as WsWebSocket } from 'ws'
+import { WebSocket as UndiciWebSocket } from '../../index.js'
+import { bench, run, lineplot } from 'mitata'
+
+const __BINARY_SIZE__ = 1024 * 512
+
+const binary = Buffer.alloc(__BINARY_SIZE__, '_').toString('utf-8')
+
+const url = 'http://localhost:5001'
+
+const connections = []
+
+lineplot(() => {
+  {
+    const ws = new WsWebSocket(url)
+    let _resolve
+    ws.on('message', () => {
+      _resolve()
+    })
+    bench('ws ($messages)', function * (state) {
+      const messages = state.get('messages')
+      const chunk = binary.subarray(0, __BINARY_SIZE__ / messages)
+      yield () => new Promise((resolve, reject) => {
+        for (let i = 0; i < messages; ++i) ws.send(chunk)
+        let id = 0
+        _resolve = () => {
+          if (++id === messages) {
+            resolve()
+          }
+        }
+      })
+    }).range('messages', 1, 256)
+    connections.push(ws)
+  }
+  {
+    const ws = new UndiciWebSocket(url)
+    let _resolve
+    ws.addEventListener('message', () => {
+      _resolve()
+    })
+    bench('undici ($messages)', function * (state) {
+      const messages = state.get('messages')
+      const chunk = binary.subarray(0, __BINARY_SIZE__ / messages)
+      yield () => new Promise((resolve, reject) => {
+        for (let i = 0; i < messages; ++i) ws.send(chunk)
+        let id = 0
+        _resolve = () => {
+          if (++id === messages) {
+            resolve()
+          }
+        }
+      })
+    }).range('messages', 1, 256)
+    connections.push(ws)
+  }
+})
+
+for (const ws of connections) {
+  // for fairness
+  ws.binaryType = 'arraybuffer'
+  await new Promise((resolve, reject) => {
+    ws.addEventListener('open', () => {
+      resolve()
+    })
+    ws.addEventListener('error', (err) => {
+      reject(err)
+    })
+  })
+}
+
+await run()
+
+for (const ws of connections) {
+  ws.close()
+}