diff --git a/src/mockServiceWorker.js b/src/mockServiceWorker.js
index 2298cd2a8..c564eeaf0 100644
--- a/src/mockServiceWorker.js
+++ b/src/mockServiceWorker.js
@@ -9,15 +9,14 @@
  */
 
 const INTEGRITY_CHECKSUM = '<INTEGRITY_CHECKSUM>'
-const bypassHeaderName = 'x-msw-bypass'
 const activeClientIds = new Set()
 
 self.addEventListener('install', function () {
-  return self.skipWaiting()
+  self.skipWaiting()
 })
 
-self.addEventListener('activate', async function (event) {
-  return self.clients.claim()
+self.addEventListener('activate', function (event) {
+  event.waitUntil(self.clients.claim())
 })
 
 self.addEventListener('message', async function (event) {
@@ -33,7 +32,9 @@ self.addEventListener('message', async function (event) {
     return
   }
 
-  const allClients = await self.clients.matchAll()
+  const allClients = await self.clients.matchAll({
+    type: 'window',
+  })
 
   switch (event.data) {
     case 'KEEPALIVE_REQUEST': {
@@ -83,30 +84,58 @@ self.addEventListener('message', async function (event) {
   }
 })
 
-// Resolve the "main" client for the given event.
-// Client that issues a request doesn't necessarily equal the client
-// that registered the worker. It's with the latter the worker should
-// communicate with during the response resolving phase.
-async function resolveMainClient(event) {
-  const client = await self.clients.get(event.clientId)
+self.addEventListener('fetch', function (event) {
+  const { request } = event
+  const accept = request.headers.get('accept') || ''
 
-  if (client.frameType === 'top-level') {
-    return client
+  // Bypass server-sent events.
+  if (accept.includes('text/event-stream')) {
+    return
   }
 
-  const allClients = await self.clients.matchAll()
+  // Bypass navigation requests.
+  if (request.mode === 'navigate') {
+    return
+  }
 
-  return allClients
-    .filter((client) => {
-      // Get only those clients that are currently visible.
-      return client.visibilityState === 'visible'
-    })
-    .find((client) => {
-      // Find the client ID that's recorded in the
-      // set of clients that have registered the worker.
-      return activeClientIds.has(client.id)
-    })
-}
+  // Opening the DevTools triggers the "only-if-cached" request
+  // that cannot be handled by the worker. Bypass such requests.
+  if (request.cache === 'only-if-cached' && request.mode !== 'same-origin') {
+    return
+  }
+
+  // Bypass all requests when there are no active clients.
+  // Prevents the self-unregistered worked from handling requests
+  // after it's been deleted (still remains active until the next reload).
+  if (activeClientIds.size === 0) {
+    return
+  }
+
+  // Generate unique request ID.
+  const requestId = Math.random().toString(16).slice(2)
+
+  event.respondWith(
+    handleRequest(event, requestId).catch((error) => {
+      if (error.name === 'NetworkError') {
+        console.warn(
+          '[MSW] Successfully emulated a network error for the "%s %s" request.',
+          request.method,
+          request.url,
+        )
+        return
+      }
+
+      // At this point, any exception indicates an issue with the original request/response.
+      console.error(
+        `\
+[MSW] Caught an exception from the "%s %s" request (%s). This is probably not a problem with Mock Service Worker. There is likely an additional logging output above.`,
+        request.method,
+        request.url,
+        `${error.name}: ${error.message}`,
+      )
+    }),
+  )
+})
 
 async function handleRequest(event, requestId) {
   const client = await resolveMainClient(event)
@@ -128,7 +157,7 @@ async function handleRequest(event, requestId) {
           statusText: clonedResponse.statusText,
           body:
             clonedResponse.body === null ? null : await clonedResponse.text(),
-          headers: serializeHeaders(clonedResponse.headers),
+          headers: Object.fromEntries(clonedResponse.headers.entries()),
           redirected: clonedResponse.redirected,
         },
       })
@@ -138,14 +167,54 @@ async function handleRequest(event, requestId) {
   return response
 }
 
+// Resolve the main client for the given event.
+// Client that issues a request doesn't necessarily equal the client
+// that registered the worker. It's with the latter the worker should
+// communicate with during the response resolving phase.
+async function resolveMainClient(event) {
+  const client = await self.clients.get(event.clientId)
+
+  if (client.frameType === 'top-level') {
+    return client
+  }
+
+  const allClients = await self.clients.matchAll({
+    type: 'window',
+  })
+
+  return allClients
+    .filter((client) => {
+      // Get only those clients that are currently visible.
+      return client.visibilityState === 'visible'
+    })
+    .find((client) => {
+      // Find the client ID that's recorded in the
+      // set of clients that have registered the worker.
+      return activeClientIds.has(client.id)
+    })
+}
+
 async function getResponse(event, client, requestId) {
   const { request } = event
-  const requestClone = request.clone()
-  const getOriginalResponse = () => fetch(requestClone)
+  const clonedRequest = request.clone()
+
+  function passthrough() {
+    // Clone the request because it might've been already used
+    // (i.e. its body has been read and sent to the cilent).
+    const headers = Object.fromEntries(clonedRequest.headers.entries())
 
-  // Bypass mocking when the request client is not active.
+    // Remove MSW-specific request headers so the bypassed requests
+    // comply with the server's CORS preflight check.
+    // Operate with the headers as an object because request "Headers"
+    // are immutable.
+    delete headers['x-msw-bypass']
+
+    return fetch(clonedRequest, { headers })
+  }
+
+  // Bypass mocking when the client is not active.
   if (!client) {
-    return getOriginalResponse()
+    return passthrough()
   }
 
   // Bypass initial page load requests (i.e. static assets).
@@ -153,34 +222,30 @@ async function getResponse(event, client, requestId) {
   // means that MSW hasn't dispatched the "MOCK_ACTIVATE" event yet
   // and is not ready to handle requests.
   if (!activeClientIds.has(client.id)) {
-    return await getOriginalResponse()
+    return passthrough()
   }
 
-  // Bypass requests with the explicit bypass header
-  if (requestClone.headers.get(bypassHeaderName) === 'true') {
-    const cleanRequestHeaders = serializeHeaders(requestClone.headers)
-
-    // Remove the bypass header to comply with the CORS preflight check.
-    delete cleanRequestHeaders[bypassHeaderName]
-
-    const originalRequest = new Request(requestClone, {
-      headers: new Headers(cleanRequestHeaders),
-    })
-
-    return fetch(originalRequest)
+  // Bypass requests with the explicit bypass header.
+  // Such requests can be issued by "ctx.fetch()".
+  if (request.headers.get('x-msw-bypass') === 'true') {
+    return passthrough()
   }
 
-  // Send the request to the client-side MSW.
-  const reqHeaders = serializeHeaders(request.headers)
-  const body = await request.text()
+  // Create a communication channel scoped to the current request.
+  // This way events can be exchanged outside of the worker's global
+  // "message" event listener (i.e. abstracted into functions).
+  const operationChannel = new BroadcastChannel(
+    `msw-response-stream-${requestId}`,
+  )
 
+  // Notify the client that a request has been intercepted.
   const clientMessage = await sendToClient(client, {
     type: 'REQUEST',
     payload: {
       id: requestId,
       url: request.url,
       method: request.method,
-      headers: reqHeaders,
+      headers: Object.fromEntries(request.headers.entries()),
       cache: request.cache,
       mode: request.mode,
       credentials: request.credentials,
@@ -189,22 +254,23 @@ async function getResponse(event, client, requestId) {
       redirect: request.redirect,
       referrer: request.referrer,
       referrerPolicy: request.referrerPolicy,
-      body,
+      body: await request.text(),
       bodyUsed: request.bodyUsed,
       keepalive: request.keepalive,
     },
   })
 
   switch (clientMessage.type) {
-    case 'MOCK_SUCCESS': {
-      return delayPromise(
-        () => respondWithMock(clientMessage),
-        clientMessage.payload.delay,
-      )
+    case 'MOCK_RESPONSE': {
+      return respondWithMock(clientMessage.payload)
+    }
+
+    case 'MOCK_RESPONSE_START': {
+      return respondWithMockStream(operationChannel, clientMessage.payload)
     }
 
     case 'MOCK_NOT_FOUND': {
-      return getOriginalResponse()
+      return passthrough()
     }
 
     case 'NETWORK_ERROR': {
@@ -212,7 +278,7 @@ async function getResponse(event, client, requestId) {
       const networkError = new Error(message)
       networkError.name = name
 
-      // Rejecting a request Promise emulates a network error.
+      // Rejecting a "respondWith" promise emulates a network error.
       throw networkError
     }
 
@@ -231,73 +297,11 @@ This exception has been gracefully handled as a 500 response, however, it's stro
         request.url,
       )
 
-      return respondWithMock(clientMessage)
+      return respondWithMock(clientMessage.payload)
     }
   }
 
-  return getOriginalResponse()
-}
-
-self.addEventListener('fetch', function (event) {
-  const { request } = event
-  const accept = request.headers.get('accept') || ''
-
-  // Bypass server-sent events.
-  if (accept.includes('text/event-stream')) {
-    return
-  }
-
-  // Bypass navigation requests.
-  if (request.mode === 'navigate') {
-    return
-  }
-
-  // Opening the DevTools triggers the "only-if-cached" request
-  // that cannot be handled by the worker. Bypass such requests.
-  if (request.cache === 'only-if-cached' && request.mode !== 'same-origin') {
-    return
-  }
-
-  // Bypass all requests when there are no active clients.
-  // Prevents the self-unregistered worked from handling requests
-  // after it's been deleted (still remains active until the next reload).
-  if (activeClientIds.size === 0) {
-    return
-  }
-
-  const requestId = uuidv4()
-
-  return event.respondWith(
-    handleRequest(event, requestId).catch((error) => {
-      if (error.name === 'NetworkError') {
-        console.warn(
-          '[MSW] Successfully emulated a network error for the "%s %s" request.',
-          request.method,
-          request.url,
-        )
-        return
-      }
-
-      // At this point, any exception indicates an issue with the original request/response.
-      console.error(
-        `\
-[MSW] Caught an exception from the "%s %s" request (%s). This is probably not a problem with Mock Service Worker. There is likely an additional logging output above.`,
-        request.method,
-        request.url,
-        `${error.name}: ${error.message}`,
-      )
-    }),
-  )
-})
-
-function serializeHeaders(headers) {
-  const reqHeaders = {}
-  headers.forEach((value, name) => {
-    reqHeaders[name] = reqHeaders[name]
-      ? [].concat(reqHeaders[name]).concat(value)
-      : value
-  })
-  return reqHeaders
+  return passthrough()
 }
 
 function sendToClient(client, message) {
@@ -316,23 +320,48 @@ function sendToClient(client, message) {
   })
 }
 
-function delayPromise(cb, duration) {
+function sleep(timeMs) {
   return new Promise((resolve) => {
-    setTimeout(() => resolve(cb()), duration)
+    setTimeout(resolve, timeMs)
   })
 }
 
-function respondWithMock(clientMessage) {
-  return new Response(clientMessage.payload.body, {
-    ...clientMessage.payload,
-    headers: clientMessage.payload.headers,
-  })
+async function respondWithMock(response) {
+  await sleep(response.delay)
+  return new Response(response.body, response)
 }
 
-function uuidv4() {
-  return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function (c) {
-    const r = (Math.random() * 16) | 0
-    const v = c == 'x' ? r : (r & 0x3) | 0x8
-    return v.toString(16)
+function respondWithMockStream(operationChannel, mockResponse) {
+  let streamCtrl
+  const stream = new ReadableStream({
+    start: (controller) => (streamCtrl = controller),
+  })
+
+  return new Promise(async (resolve, reject) => {
+    operationChannel.onmessageerror = (event) => {
+      operationChannel.close()
+      return reject(event.data.error)
+    }
+
+    operationChannel.onmessage = (event) => {
+      if (!event.data) {
+        return
+      }
+
+      switch (event.data.type) {
+        case 'MOCK_RESPONSE_CHUNK': {
+          streamCtrl.enqueue(event.data.payload)
+          break
+        }
+
+        case 'MOCK_RESPONSE_END': {
+          streamCtrl.close()
+          operationChannel.close()
+        }
+      }
+    }
+
+    await sleep(mockResponse.delay)
+    return resolve(new Response(stream, mockResponse))
   })
 }
diff --git a/src/setupWorker/glossary.ts b/src/setupWorker/glossary.ts
index 848b3ca24..417f1dbed 100644
--- a/src/setupWorker/glossary.ts
+++ b/src/setupWorker/glossary.ts
@@ -5,7 +5,7 @@ import {
   LifeCycleEventsMap,
   SharedOptions,
 } from '../sharedOptions'
-import { ServiceWorkerMessage } from '../utils/createBroadcastChannel'
+import { ServiceWorkerMessage } from './start/utils/createMessageChannel'
 import { DefaultBodyType, RequestHandler } from '../handlers/RequestHandler'
 import type { HttpRequestEventMap, Interceptor } from '@mswjs/interceptors'
 import { Path } from '../utils/matching/matchRequestUrl'
@@ -76,11 +76,19 @@ export type ServiceWorkerOutgoingEventTypes =
  * Map of the events that can be sent to the Service Worker
  * only as a part of a single `fetch` event handler.
  */
-export type ServiceWorkerFetchEventTypes =
-  | 'MOCK_SUCCESS'
-  | 'MOCK_NOT_FOUND'
-  | 'NETWORK_ERROR'
-  | 'INTERNAL_ERROR'
+export interface ServiceWorkerFetchEventMap {
+  MOCK_RESPONSE(payload: SerializedResponse): void
+  MOCK_RESPONSE_START(payload: SerializedResponse): void
+
+  MOCK_NOT_FOUND(): void
+  NETWORK_ERROR(payload: { name: string; message: string }): void
+  INTERNAL_ERROR(payload: { status: number; body: string }): void
+}
+
+export interface ServiceWorkerBroadcastChannelMessageMap {
+  MOCK_RESPONSE_CHUNK(payload: Uint8Array): void
+  MOCK_RESPONSE_END(): void
+}
 
 export type WorkerLifecycleEventsMap = LifeCycleEventsMap<Response>
 
diff --git a/src/setupWorker/setupWorker.ts b/src/setupWorker/setupWorker.ts
index fb1e7323f..0ede80180 100644
--- a/src/setupWorker/setupWorker.ts
+++ b/src/setupWorker/setupWorker.ts
@@ -9,7 +9,7 @@ import {
 import { createStartHandler } from './start/createStartHandler'
 import { createStop } from './stop/createStop'
 import * as requestHandlerUtils from '../utils/internal/requestHandlerUtils'
-import { ServiceWorkerMessage } from '../utils/createBroadcastChannel'
+import { ServiceWorkerMessage } from './start/utils/createMessageChannel'
 import { jsonParse } from '../utils/internal/jsonParse'
 import { RequestHandler } from '../handlers/RequestHandler'
 import { RestHandler } from '../handlers/RestHandler'
diff --git a/src/utils/worker/createFallbackRequestListener.ts b/src/setupWorker/start/createFallbackRequestListener.ts
similarity index 91%
rename from src/utils/worker/createFallbackRequestListener.ts
rename to src/setupWorker/start/createFallbackRequestListener.ts
index da7838e80..5d47cf1f1 100644
--- a/src/utils/worker/createFallbackRequestListener.ts
+++ b/src/setupWorker/start/createFallbackRequestListener.ts
@@ -10,10 +10,10 @@ import {
   SerializedResponse,
   SetupWorkerInternalContext,
   StartOptions,
-} from '../../setupWorker/glossary'
+} from '../glossary'
 import type { RequiredDeep } from '../../typeUtils'
-import { handleRequest } from '../handleRequest'
-import { parseIsomorphicRequest } from '../request/parseIsomorphicRequest'
+import { handleRequest } from '../../utils/handleRequest'
+import { parseIsomorphicRequest } from '../../utils/request/parseIsomorphicRequest'
 
 export function createFallbackRequestListener(
   context: SetupWorkerInternalContext,
diff --git a/src/setupWorker/start/createFallbackStart.ts b/src/setupWorker/start/createFallbackStart.ts
index f387f147c..cdc88bd61 100644
--- a/src/setupWorker/start/createFallbackStart.ts
+++ b/src/setupWorker/start/createFallbackStart.ts
@@ -1,4 +1,4 @@
-import { createFallbackRequestListener } from '../../utils/worker/createFallbackRequestListener'
+import { createFallbackRequestListener } from './createFallbackRequestListener'
 import { SetupWorkerInternalContext, StartHandler } from '../glossary'
 import { printStartMessage } from './utils/printStartMessage'
 
diff --git a/src/utils/worker/createRequestListener.ts b/src/setupWorker/start/createRequestListener.ts
similarity index 65%
rename from src/utils/worker/createRequestListener.ts
rename to src/setupWorker/start/createRequestListener.ts
index eaf356e77..4e3a32bdd 100644
--- a/src/utils/worker/createRequestListener.ts
+++ b/src/setupWorker/start/createRequestListener.ts
@@ -3,17 +3,20 @@ import {
   SerializedResponse,
   SetupWorkerInternalContext,
   ServiceWorkerIncomingEventsMap,
-} from '../../setupWorker/glossary'
+  ServiceWorkerBroadcastChannelMessageMap,
+} from '../glossary'
 import {
   ServiceWorkerMessage,
-  createBroadcastChannel,
-} from '../createBroadcastChannel'
-import { NetworkError } from '../NetworkError'
-import { parseWorkerRequest } from '../request/parseWorkerRequest'
-import { handleRequest } from '../handleRequest'
+  createMessageChannel,
+} from './utils/createMessageChannel'
+import { NetworkError } from '../../utils/NetworkError'
+import { parseWorkerRequest } from '../../utils/request/parseWorkerRequest'
+import { handleRequest } from '../../utils/handleRequest'
 import { RequestHandler } from '../../handlers/RequestHandler'
 import { RequiredDeep } from '../../typeUtils'
 import { MockedResponse } from '../../response'
+import { streamResponse } from './utils/streamResponse'
+import { StrictBroadcastChannel } from '../../utils/internal/StrictBroadcastChannel'
 
 export const createRequestListener = (
   context: SetupWorkerInternalContext,
@@ -26,10 +29,15 @@ export const createRequestListener = (
       ServiceWorkerIncomingEventsMap['REQUEST']
     >,
   ) => {
-    const channel = createBroadcastChannel(event)
+    const messageChannel = createMessageChannel(event)
 
     try {
       const request = parseWorkerRequest(message.payload)
+      const operationChannel =
+        new StrictBroadcastChannel<ServiceWorkerBroadcastChannelMessageMap>(
+          `msw-response-stream-${request.id}`,
+        )
+
       await handleRequest<SerializedResponse>(
         request,
         context.requestHandlers,
@@ -38,15 +46,22 @@ export const createRequestListener = (
         {
           transformResponse,
           onPassthroughResponse() {
-            return channel.send({
+            return messageChannel.send({
               type: 'MOCK_NOT_FOUND',
             })
           },
           onMockedResponse(response) {
-            channel.send({
-              type: 'MOCK_SUCCESS',
-              payload: response,
-            })
+            // Signal the mocked responses without bodies immediately.
+            // There is nothing to stream, so no need to initiate streaming.
+            if (response.body == null) {
+              return messageChannel.send({
+                type: 'MOCK_RESPONSE',
+                payload: response,
+              })
+            }
+
+            // If the mocked response has a body, stream it to the worker.
+            streamResponse(operationChannel, messageChannel, response)
           },
           onMockedResponseSent(
             response,
@@ -69,7 +84,7 @@ export const createRequestListener = (
       if (error instanceof NetworkError) {
         // Treat emulated network error differently,
         // as it is an intended exception in a request handler.
-        return channel.send({
+        return messageChannel.send({
           type: 'NETWORK_ERROR',
           payload: {
             name: error.name,
@@ -81,7 +96,7 @@ export const createRequestListener = (
       if (error instanceof Error) {
         // Treat all the other exceptions in a request handler
         // as unintended, alerting that there is a problem needs fixing.
-        channel.send({
+        messageChannel.send({
           type: 'INTERNAL_ERROR',
           payload: {
             status: 500,
diff --git a/src/utils/worker/createResponseListener.ts b/src/setupWorker/start/createResponseListener.ts
similarity index 94%
rename from src/utils/worker/createResponseListener.ts
rename to src/setupWorker/start/createResponseListener.ts
index 24dfd7034..6fa37ad89 100644
--- a/src/utils/worker/createResponseListener.ts
+++ b/src/setupWorker/start/createResponseListener.ts
@@ -2,7 +2,7 @@ import {
   ServiceWorkerIncomingEventsMap,
   SetupWorkerInternalContext,
 } from '../../setupWorker/glossary'
-import { ServiceWorkerMessage } from '../createBroadcastChannel'
+import { ServiceWorkerMessage } from './utils/createMessageChannel'
 
 export function createResponseListener(context: SetupWorkerInternalContext) {
   return (
diff --git a/src/setupWorker/start/createStartHandler.ts b/src/setupWorker/start/createStartHandler.ts
index c0e3022e3..c7a127593 100644
--- a/src/setupWorker/start/createStartHandler.ts
+++ b/src/setupWorker/start/createStartHandler.ts
@@ -2,10 +2,10 @@ import { until } from '@open-draft/until'
 import { getWorkerInstance } from './utils/getWorkerInstance'
 import { enableMocking } from './utils/enableMocking'
 import { SetupWorkerInternalContext, StartHandler } from '../glossary'
-import { createRequestListener } from '../../utils/worker/createRequestListener'
+import { createRequestListener } from './createRequestListener'
 import { requestIntegrityCheck } from '../../utils/internal/requestIntegrityCheck'
 import { deferNetworkRequestsUntil } from '../../utils/deferNetworkRequestsUntil'
-import { createResponseListener } from '../../utils/worker/createResponseListener'
+import { createResponseListener } from './createResponseListener'
 import { validateWorkerScope } from './utils/validateWorkerScope'
 import { devUtils } from '../../utils/internal/devUtils'
 
@@ -25,6 +25,7 @@ export const createStartHandler = (
         createRequestListener(context, options),
       )
 
+      // Handle responses signaled by the worker.
       context.workerChannel.on('RESPONSE', createResponseListener(context))
 
       const instance = await getWorkerInstance(
diff --git a/src/setupWorker/start/utils/createMessageChannel.ts b/src/setupWorker/start/utils/createMessageChannel.ts
new file mode 100644
index 000000000..912cac54d
--- /dev/null
+++ b/src/setupWorker/start/utils/createMessageChannel.ts
@@ -0,0 +1,46 @@
+import {
+  ServiceWorkerFetchEventMap,
+  ServiceWorkerIncomingEventsMap,
+} from '../../glossary'
+
+export interface ServiceWorkerMessage<
+  EventType extends keyof ServiceWorkerIncomingEventsMap,
+  EventPayload,
+> {
+  type: EventType
+  payload: EventPayload
+}
+
+export interface WorkerMessageChannel {
+  send<Event extends keyof ServiceWorkerFetchEventMap>(
+    message: Parameters<ServiceWorkerFetchEventMap[Event]>[0] extends undefined
+      ? { type: Event }
+      : {
+          type: Event
+          payload: Parameters<ServiceWorkerFetchEventMap[Event]>[0]
+        },
+  ): void
+}
+
+/**
+ * Creates a communication channel between the client
+ * and the Service Worker associated with the given event.
+ */
+export function createMessageChannel(
+  event: MessageEvent,
+): WorkerMessageChannel {
+  const port = event.ports[0]
+
+  return {
+    /**
+     * Send a text message to the connected Service Worker.
+     */
+    send(message) {
+      if (!port) {
+        return
+      }
+
+      port.postMessage(message)
+    },
+  }
+}
diff --git a/src/setupWorker/start/utils/streamResponse.ts b/src/setupWorker/start/utils/streamResponse.ts
new file mode 100644
index 000000000..8f8b46a5a
--- /dev/null
+++ b/src/setupWorker/start/utils/streamResponse.ts
@@ -0,0 +1,56 @@
+import { invariant } from 'outvariant'
+import { StrictBroadcastChannel } from '../../../utils/internal/StrictBroadcastChannel'
+import {
+  SerializedResponse,
+  ServiceWorkerBroadcastChannelMessageMap,
+} from '../../glossary'
+import { WorkerMessageChannel } from './createMessageChannel'
+
+export async function streamResponse(
+  operationChannel: StrictBroadcastChannel<ServiceWorkerBroadcastChannelMessageMap>,
+  messageChannel: WorkerMessageChannel,
+  mockedResponse: SerializedResponse,
+): Promise<void> {
+  const response = new Response(mockedResponse.body, mockedResponse)
+
+  /**
+   * Delete the ReadableStream response body
+   * so it doesn't get sent via the message channel.
+   * @note Otherwise, an error: cannot clone a ReadableStream if
+   * it hasn't been transformed yet.
+   */
+  delete mockedResponse.body
+
+  // Signal the mock response stream start event on the global
+  // message channel because the worker expects an event in response
+  // to the sent "REQUEST" global event.
+  messageChannel.send({
+    type: 'MOCK_RESPONSE_START',
+    payload: mockedResponse,
+  })
+
+  invariant(response.body, 'Failed to stream mocked response with no body')
+
+  // Read the mocked response body as stream
+  // and pipe it to the worker.
+  const reader = response.body.getReader()
+
+  while (true) {
+    const { done, value } = await reader.read()
+
+    if (!done) {
+      operationChannel.postMessage({
+        type: 'MOCK_RESPONSE_CHUNK',
+        payload: value,
+      })
+      continue
+    }
+
+    operationChannel.postMessage({
+      type: 'MOCK_RESPONSE_END',
+    })
+    operationChannel.close()
+    reader.releaseLock()
+    break
+  }
+}
diff --git a/src/utils/createBroadcastChannel.ts b/src/utils/createBroadcastChannel.ts
deleted file mode 100644
index a11d67e78..000000000
--- a/src/utils/createBroadcastChannel.ts
+++ /dev/null
@@ -1,34 +0,0 @@
-import {
-  ServiceWorkerFetchEventTypes,
-  ServiceWorkerIncomingEventsMap,
-} from '../setupWorker/glossary'
-
-export interface ServiceWorkerMessage<
-  EventType extends keyof ServiceWorkerIncomingEventsMap,
-  EventPayload,
-> {
-  type: EventType
-  payload: EventPayload
-}
-
-/**
- * Creates a communication channel between the client
- * and the Service Worker associated with the given event.
- */
-export const createBroadcastChannel = (event: MessageEvent) => {
-  const port = event.ports[0]
-
-  return {
-    /**
-     * Sends a text message to the connected Service Worker.
-     */
-    send(message: {
-      type: ServiceWorkerFetchEventTypes
-      payload?: Record<string, any> | string
-    }) {
-      if (port) {
-        port.postMessage(message)
-      }
-    },
-  }
-}
diff --git a/src/utils/internal/StrictBroadcastChannel.ts b/src/utils/internal/StrictBroadcastChannel.ts
new file mode 100644
index 000000000..15b7237e4
--- /dev/null
+++ b/src/utils/internal/StrictBroadcastChannel.ts
@@ -0,0 +1,27 @@
+const ParentClass =
+  typeof BroadcastChannel == 'undefined'
+    ? class UnsupportedEnvironment {
+        constructor() {
+          throw new Error(
+            'Cannot construct BroadcastChannel in a non-browser environment',
+          )
+        }
+      }
+    : BroadcastChannel
+
+export class StrictBroadcastChannel<
+  MessageMap extends Record<string, any>,
+> extends (ParentClass as unknown as { new (name: string): BroadcastChannel }) {
+  public postMessage<MessageType extends keyof MessageMap>(
+    message: Parameters<MessageMap[MessageType]>[0] extends undefined
+      ? {
+          type: MessageType
+        }
+      : {
+          type: MessageType
+          payload: Parameters<MessageMap[MessageType]>[0]
+        },
+  ): void {
+    return super.postMessage(message)
+  }
+}
diff --git a/test/msw-api/context/delay.node.test.ts b/test/msw-api/context/delay.node.test.ts
index 279e8fbc2..adc685ae1 100644
--- a/test/msw-api/context/delay.node.test.ts
+++ b/test/msw-api/context/delay.node.test.ts
@@ -53,7 +53,6 @@ test('uses realistic server response time when no duration is provided', async (
 
   // Realistic server response time in Node.js is set to 5ms.
   expect(responseTime).toBeGreaterThan(5)
-  expect(responseTime).toBeLessThan(100)
   expect(await res.text()).toBe('john')
 })