diff --git a/.circleci/src/pipeline/@pipeline.yml b/.circleci/src/pipeline/@pipeline.yml
index 29d1b648191..7cdf2548014 100644
--- a/.circleci/src/pipeline/@pipeline.yml
+++ b/.circleci/src/pipeline/@pipeline.yml
@@ -1967,6 +1967,11 @@ jobs:
             source ./system-tests/scripts/bootstrap-docker-container.sh 'yarn cypress run --component --spec src/mount.cy.ts src/App.cy.ts'
 
   system-tests-chrome:
+    parameters:
+      <<: *defaultsParameters
+      run-index:
+        type: integer
+        default: 1
     <<: *defaults
     resource_class: medium+
     parallelism: 8
@@ -2067,6 +2072,9 @@ jobs:
     <<: *defaults
     parameters:
       <<: *defaultsParameters
+      run-index:
+        type: integer
+        default: 1
       resource_class:
         type: string
         default: medium+
diff --git a/.circleci/src/pipeline/workflows/pull-request.yml b/.circleci/src/pipeline/workflows/pull-request.yml
index 8f7c6a652ee..ef62b0e37aa 100644
--- a/.circleci/src/pipeline/workflows/pull-request.yml
+++ b/.circleci/src/pipeline/workflows/pull-request.yml
@@ -1,6 +1,9 @@
 # The workflow runs for:
 # External PR after approval (approved contributor PR that's not a main branch)
 # Internal PR for any branch that does is not develop or release/ related
+#
+# TEMPORARY: Reduced to system-tests-chrome (x10) + run-app-component-tests-chrome (x10) + deps for CI testing.
+# Restore full job list from git history when done.
 when:
   and:
     - not:
@@ -32,63 +35,11 @@ jobs:
       filters:
         branches:
           only: /^pull\/[0-9]+/
-  - check-ts:
-      requires:
-        - internal-pr-build
-        - external-pr-build
-  - health-check:
-      requires:
-        - internal-pr-build
-        - external-pr-build
-  - lint:
-      name: linux-lint
-      requires:
-        - internal-pr-build
-        - external-pr-build
-  - lint-types:
-      requires:
-        - internal-pr-build
-        - external-pr-build
   - approve-contributor-pr:
       type: approval
       filters:
         branches:
           only: /^pull\/[0-9]+/
-
-  # The following jobs are only run for contributor PRs once they are approved
-  # unit, integration and e2e tests
-  - cli-visual-tests:
-      context: test-runner:percy
-      requires:
-        - internal-pr-build
-        - external-pr-build
-        - approve-contributor-pr
-  - unit-tests:
-      requires:
-        - internal-pr-build
-        - external-pr-build
-        - approve-contributor-pr
-  - verify-release-readiness:
-      context: [test-runner:npm-release, org-npm-credentials]
-      requires:
-        - internal-pr-build
-        - external-pr-build
-        - approve-contributor-pr
-  - server-unit-tests:
-      requires:
-        - internal-pr-build
-        - external-pr-build
-        - approve-contributor-pr
-  - server-integration-tests:
-      requires:
-        - internal-pr-build
-        - external-pr-build
-        - approve-contributor-pr
-  - server-performance-tests:
-      requires:
-        - internal-pr-build
-        - external-pr-build
-        - approve-contributor-pr
   - system-tests-node-modules-install:
       context: test-runner:performance-tracking
       requires:
@@ -97,126 +48,9 @@ jobs:
         - approve-contributor-pr
   - system-tests-chrome:
       context: test-runner:performance-tracking
-      requires:
-        - system-tests-node-modules-install
-  - system-tests-electron:
-      context: test-runner:performance-tracking
-      requires:
-        - system-tests-node-modules-install
-  - system-tests-firefox:
-      context: test-runner:performance-tracking
-      requires:
-        - system-tests-node-modules-install
-  - system-tests-webkit:
-      context: test-runner:performance-tracking
-      requires:
-        - system-tests-node-modules-install
-  - system-tests-non-root:
-      context: test-runner:performance-tracking
-      executor: non-root-docker-user
-      requires:
-        - system-tests-node-modules-install
-  - driver-integration-tests-chrome:
-      context: test-runner:cypress-record-key
-      requires:
-        - internal-pr-build
-        - external-pr-build
-        - approve-contributor-pr
-  - driver-integration-tests-chrome-inject-document-domain:
-      context: test-runner:cypress-record-key
-      requires:
-        - internal-pr-build
-        - external-pr-build
-        - approve-contributor-pr
-  - driver-integration-tests-chrome-beta:
-      context: test-runner:cypress-record-key
-      requires:
-        - internal-pr-build
-        - external-pr-build
-        - approve-contributor-pr
-  - driver-integration-tests-chrome-beta-inject-document-domain:
-      context: test-runner:cypress-record-key
-      requires:
-        - internal-pr-build
-        - external-pr-build
-        - approve-contributor-pr
-  - driver-integration-tests-firefox:
-      context: test-runner:cypress-record-key
-      requires:
-        - internal-pr-build
-        - external-pr-build
-        - approve-contributor-pr
-  - driver-integration-tests-electron:
-      context: test-runner:cypress-record-key
-      requires:
-        - internal-pr-build
-        - external-pr-build
-        - approve-contributor-pr
-  - driver-integration-tests-webkit:
-      context: test-runner:cypress-record-key
-      requires:
-        - internal-pr-build
-        - external-pr-build
-        - approve-contributor-pr
-  - driver-integration-memory-tests:
-      requires:
-        - internal-pr-build
-        - external-pr-build
-        - approve-contributor-pr
-  - run-frontend-shared-component-tests-chrome:
-      context:
-        [
-          test-runner:cypress-record-key,
-          test-runner:launchpad-tests,
-          test-runner:percy
-        ]
-      percy: true
-      requires:
-        - internal-pr-build
-        - external-pr-build
-        - approve-contributor-pr
-  - run-launchpad-integration-tests-chrome:
-      context:
-        [
-          test-runner:cypress-record-key,
-          test-runner:launchpad-tests,
-          test-runner:percy
-        ]
-      percy: true
-      requires:
-        - internal-pr-build
-        - external-pr-build
-        - approve-contributor-pr
-  - run-launchpad-component-tests-chrome:
-      context:
-        [
-          test-runner:cypress-record-key,
-          test-runner:launchpad-tests,
-          test-runner:percy
-        ]
-      percy: true
-      requires:
-        - internal-pr-build
-        - external-pr-build
-        - approve-contributor-pr
-  - run-app-integration-tests-chrome:
-      context:
-        [
-          test-runner:cypress-record-key,
-          test-runner:launchpad-tests,
-          test-runner:percy
-        ]
-      percy: true
-      requires:
-        - internal-pr-build
-        - external-pr-build
-        - approve-contributor-pr
-  - run-webpack-dev-server-integration-tests:
-      context: [ test-runner:cypress-record-key, test-runner:percy ]
-      requires:
-        - system-tests-node-modules-install
-  - run-vite-dev-server-integration-tests:
-      context: [ test-runner:cypress-record-key, test-runner:percy ]
+      matrix:
+        parameters:
+          run-index: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
       requires:
         - system-tests-node-modules-install
   - run-app-component-tests-chrome:
@@ -227,201 +61,10 @@ jobs:
           test-runner:percy
         ]
       percy: true
+      matrix:
+        parameters:
+          run-index: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
       requires:
         - internal-pr-build
         - external-pr-build
-        - approve-contributor-pr
-  - run-reporter-component-tests-chrome:
-      context: [ test-runner:cypress-record-key, test-runner:percy ]
-      percy: true
-      requires:
-        - internal-pr-build
-        - external-pr-build
-        - approve-contributor-pr
-  - reporter-integration-tests:
-      context: [ test-runner:cypress-record-key, test-runner:percy ]
-      requires:
-        - internal-pr-build
-        - external-pr-build
-        - approve-contributor-pr
-  - npm-webpack-dev-server:
-      requires:
-        - system-tests-node-modules-install
-  - npm-vite-dev-server:
-      requires:
-        - internal-pr-build
-        - external-pr-build
-        - approve-contributor-pr
-  - npm-vite-plugin-cypress-esm:
-      requires:
-        - internal-pr-build
-        - external-pr-build
-        - approve-contributor-pr
-  - npm-webpack-preprocessor:
-      requires:
-        - internal-pr-build
-        - external-pr-build
-        - approve-contributor-pr
-  - npm-webpack-batteries-included-preprocessor:
-      requires:
-        - internal-pr-build
-        - external-pr-build
-        - approve-contributor-pr
-  - npm-vue:
-      requires:
-        - internal-pr-build
-        - external-pr-build
-        - approve-contributor-pr
-  - npm-puppeteer-unit-tests:
-      requires:
-        - internal-pr-build
-        - external-pr-build
-        - approve-contributor-pr
-  - npm-puppeteer-cypress-tests:
-      requires:
-        - internal-pr-build
-        - external-pr-build
-        - approve-contributor-pr
-  - npm-react:
-      requires:
-        - internal-pr-build
-        - external-pr-build
-        - approve-contributor-pr
-  - npm-angular:
-      requires:
-        - internal-pr-build
-        - external-pr-build
-        - approve-contributor-pr
-  - npm-angular-zoneless:
-      requires:
-        - internal-pr-build
-        - external-pr-build
-        - approve-contributor-pr
-  - npm-mount-utils:
-      requires:
-        - internal-pr-build
-        - external-pr-build
-        - approve-contributor-pr
-  - npm-grep:
-      requires:
-        - internal-pr-build
-        - external-pr-build
-        - approve-contributor-pr
-  - npm-eslint-plugin-dev:
-      requires:
-        - internal-pr-build
-        - external-pr-build
-        - approve-contributor-pr
-  - npm-cypress-schematic:
-      requires:
-        - internal-pr-build
-        - external-pr-build
-        - approve-contributor-pr
-  - v8-integration-tests:
-      requires:
-        - system-tests-node-modules-install
-
-  - create-and-trigger-packaging-artifacts:
-      context:
-        - test-runner:upload
-        - test-runner:build-binary
-        - publish-binary
-      requires:
-        - node_modules_install
-        - internal-pr-build
-      filters:
-        branches:
-          ignore: /^pull\/[0-9]+/
-  - wait-for-binary-publish:
-      type: approval
-      requires:
-        - create-and-trigger-packaging-artifacts
-  - get-published-artifacts:
-      context:
-        - publish-binary
-        - test-runner:commit-status-checks
-      requires:
-        - wait-for-binary-publish
-  - test-kitchensink:
-      requires:
-        - internal-pr-build
-        - external-pr-build
-        - approve-contributor-pr
-  - test-npm-module-on-minimum-node-version:
-      context: publish-binary
-      requires:
-        - get-published-artifacts
-  - test-types-cypress-and-jest:
-      context: publish-binary
-      requires:
-        - get-published-artifacts
-  - test-full-typescript-project:
-      context: publish-binary
-      requires:
-        - get-published-artifacts
-  - test-binary-against-kitchensink:
-      context: publish-binary
-      requires:
-        - get-published-artifacts
-  - test-binary-as-specific-user:
-      name: "test binary as a non-root user"
-      executor: non-root-docker-user
-      context: publish-binary
-      requires:
-        - get-published-artifacts
-  - test-binary-as-specific-user:
-      name: "test binary as a root user"
-      context: publish-binary
-      requires:
-        - get-published-artifacts
-  - binary-system-tests:
-      context: publish-binary
-      requires:
-        - get-published-artifacts
-        - system-tests-node-modules-install
-  - yarn-pnp-preprocessor-system-test:
-      context: publish-binary
-      requires:
-        - get-published-artifacts
-        - system-tests-node-modules-install
-  - svelte-webpack-system-test:
-      context: publish-binary
-      requires:
-        - get-published-artifacts
-        - system-tests-node-modules-install
-
-  # Finalization jobs
-  - percy-finalize:
-      context: test-runner:percy
-      required_env_var: PERCY_TOKEN
-      requires:
-        - cli-visual-tests
-        - reporter-integration-tests
-        - run-app-component-tests-chrome
-        - run-app-integration-tests-chrome
-        - run-frontend-shared-component-tests-chrome
-        - run-launchpad-component-tests-chrome
-        - run-launchpad-integration-tests-chrome
-        - run-reporter-component-tests-chrome
-        - run-webpack-dev-server-integration-tests
-        - run-vite-dev-server-integration-tests
-  # Cypress run must be completed to fetch Accessibility report
-  - verify-accessibility-results:
-      context: test-runner:cypress-record-key
-      requires:
-        - reporter-integration-tests
-        - run-app-component-tests-chrome
-        - run-app-integration-tests-chrome
-        - run-frontend-shared-component-tests-chrome
-        - run-launchpad-component-tests-chrome
-        - run-launchpad-integration-tests-chrome
-        - run-reporter-component-tests-chrome
-        - run-webpack-dev-server-integration-tests
-        - run-vite-dev-server-integration-tests
-        - driver-integration-tests-firefox
-        - driver-integration-tests-chrome
-        - driver-integration-tests-chrome-inject-document-domain
-        - driver-integration-tests-chrome-beta-inject-document-domain
-        - driver-integration-tests-electron
-        - driver-integration-tests-webkit
-        - driver-integration-memory-tests
\ No newline at end of file
+        - approve-contributor-pr
\ No newline at end of file
diff --git a/npm/vite-dev-server/client/initCypressTests.js b/npm/vite-dev-server/client/initCypressTests.js
index fe44e14e6b5..bd7efda2397 100644
--- a/npm/vite-dev-server/client/initCypressTests.js
+++ b/npm/vite-dev-server/client/initCypressTests.js
@@ -5,6 +5,33 @@ const CypressInstance = window.Cypress = parent.Cypress
 
 const importsToLoad = []
 
+// Retry dynamic import to tolerate Vite dev server not ready yet (e.g. in CI).
+// "Failed to fetch dynamically imported module" can happen when the iframe loads
+// before the server has finished serving the support or spec module.
+function isRetryableImportError (err) {
+  const msg = err && err.message
+
+  return typeof msg === 'string' && (
+    msg.includes('Failed to fetch') ||
+    msg.includes('dynamically imported module') ||
+    msg.includes('Importing a module script failed')
+  )
+}
+
+function retryDynamicImport (url, maxAttempts = 4, delayMs = 400) {
+  const attempt = (n) => {
+    return import(url).catch((err) => {
+      if (n < maxAttempts && isRetryableImportError(err)) {
+        return new Promise((resolve) => setTimeout(resolve, delayMs)).then(() => attempt(n + 1))
+      }
+
+      throw err
+    })
+  }
+
+  return attempt(1)
+}
+
 /* Support file import logic, this should be removed once we
  * are able to return relative paths from the supportFile
  * Jira #UNIFY-1260
@@ -40,7 +67,7 @@ if (supportFile) {
   const relativeUrl = `${devServerPublicPathBase}${supportRelativeToProjectRoot}`
 
   importsToLoad.push({
-    load: () => import(relativeUrl),
+    load: () => retryDynamicImport(relativeUrl),
     absolute: supportFile,
     relative: supportRelativeToProjectRoot,
     relativeUrl,
@@ -62,7 +89,7 @@ if (specPath === '__all' || CypressInstance.spec.relative === '__all') {
       const specRoute = `${devServerPublicPathBase}/@fs/${normalizedPath}`
 
       importsToLoad.push({
-        load: () => import(specRoute),
+        load: () => retryDynamicImport(specRoute),
         absolute: specObj.absolute,
         relative: specObj.relative,
         relativeUrl: specRoute,
@@ -78,7 +105,7 @@ if (specPath === '__all' || CypressInstance.spec.relative === '__all') {
 
   // We need a slash before /src/my-spec.js, this does not happen by default.
   importsToLoad.push({
-    load: () => import(testFileAbsolutePathRoute),
+    load: () => retryDynamicImport(testFileAbsolutePathRoute),
     absolute: CypressInstance.spec.absolute,
     relative: CypressInstance.spec.relative,
     relativeUrl: testFileAbsolutePathRoute,
diff --git a/npm/vite-dev-server/src/devServer.ts b/npm/vite-dev-server/src/devServer.ts
index f988b0d5986..642717d365b 100644
--- a/npm/vite-dev-server/src/devServer.ts
+++ b/npm/vite-dev-server/src/devServer.ts
@@ -3,6 +3,7 @@ import semverMajor from 'semver/functions/major.js'
 import type { UserConfig } from 'vite-7'
 import { getVite, Vite } from './getVite.js'
 import { createViteDevServerConfig } from './resolveConfig.js'
+import { getSupportFileRelativePath, waitUntilUrlReady } from './waitForSupportFile.js'
 
 const debug = debugFn('cypress:vite-dev-server:devServer')
 
@@ -38,7 +39,7 @@ export async function devServer (config: ViteDevServerConfig): Promise<Cypress.R
   debug('Vite server created')
 
   await server.listen()
-  const { port } = server.config.server
+  const { port, host } = server.config.server
 
   if (!port) {
     throw new Error('Missing vite dev server port.')
@@ -46,6 +47,17 @@ export async function devServer (config: ViteDevServerConfig): Promise<Cypress.R
 
   debug('Successfully launched the vite server on port', port)
 
+  const supportPath = getSupportFileRelativePath(config.cypressConfig)
+
+  if (supportPath) {
+    const baseUrl = `http://${host ?? '127.0.0.1'}:${port}`
+    const supportFileUrl = new URL(supportPath, `${baseUrl}/`).href
+
+    debug('Waiting until support file is servable', supportFileUrl)
+    await waitUntilUrlReady(supportFileUrl)
+    debug('Support file is ready')
+  }
+
   return {
     port,
     // Close is for unit testing only. We kill this child process which will handle the closing of the server
diff --git a/npm/vite-dev-server/src/waitForSupportFile.ts b/npm/vite-dev-server/src/waitForSupportFile.ts
new file mode 100644
index 00000000000..12291357c1a
--- /dev/null
+++ b/npm/vite-dev-server/src/waitForSupportFile.ts
@@ -0,0 +1,72 @@
+/**
+ * Wait until the Vite dev server can serve the support file (HTTP 200).
+ * This makes the "dev server ready" signal deterministic and avoids the race
+ * where the iframe loads before the server has finished serving the module.
+ */
+
+const DEFAULT_MAX_ATTEMPTS = 30
+const DEFAULT_DELAY_MS = 200
+
+interface WaitUntilUrlReadyOptions {
+  maxAttempts?: number
+  delayMs?: number
+}
+
+/**
+ * Build the support file path (same logic as client/initCypressTests.js)
+ * so we poll the same URL the browser will request.
+ */
+export function getSupportFileRelativePath (cypressConfig: Cypress.PluginConfigOptions): string {
+  const { projectRoot, supportFile, devServerPublicPathRoute } = cypressConfig
+
+  if (!supportFile) {
+    return ''
+  }
+
+  let supportRelativeToProjectRoot = supportFile.replace(projectRoot, '')
+
+  if (cypressConfig.platform === 'win32') {
+    const platformProjectRoot = projectRoot.replace(/\//g, '\\')
+
+    supportRelativeToProjectRoot = supportFile.replace(platformProjectRoot, '')
+    supportRelativeToProjectRoot = supportRelativeToProjectRoot.replace(/\\/g, '/')
+  }
+
+  const devServerPublicPathBase = devServerPublicPathRoute === '' ? '.' : devServerPublicPathRoute
+
+  return `${devServerPublicPathBase}${supportRelativeToProjectRoot}`
+}
+
+/**
+ * Poll a URL until it returns a 2xx response or we exceed maxAttempts.
+ */
+export async function waitUntilUrlReady (
+  url: string,
+  options: WaitUntilUrlReadyOptions = {},
+): Promise<void> {
+  const { maxAttempts = DEFAULT_MAX_ATTEMPTS, delayMs = DEFAULT_DELAY_MS } = options
+
+  let lastError: Error | undefined
+
+  for (let attempt = 1; attempt <= maxAttempts; attempt++) {
+    try {
+      const res = await fetch(url)
+
+      if (res.ok) {
+        return
+      }
+
+      lastError = new Error(`Support file URL returned ${res.status}`)
+    } catch (err) {
+      lastError = err instanceof Error ? err : new Error(String(err))
+    }
+
+    if (attempt < maxAttempts) {
+      await new Promise((resolve) => setTimeout(resolve, delayMs))
+    }
+  }
+
+  throw new Error(
+    `Vite dev server did not become ready in time (${maxAttempts} attempts). ${lastError?.message ?? ''}`,
+  )
+}
diff --git a/npm/vite-dev-server/test/waitForSupportFile.spec.ts b/npm/vite-dev-server/test/waitForSupportFile.spec.ts
new file mode 100644
index 00000000000..90bdfc59afc
--- /dev/null
+++ b/npm/vite-dev-server/test/waitForSupportFile.spec.ts
@@ -0,0 +1,95 @@
+import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest'
+import { getSupportFileRelativePath, waitUntilUrlReady } from '../src/waitForSupportFile.js'
+
+describe('waitForSupportFile', () => {
+  describe('getSupportFileRelativePath', () => {
+    it('builds path matching client logic when devServerPublicPathRoute is set', () => {
+      const cypressConfig = {
+        projectRoot: '/users/proj',
+        supportFile: '/users/proj/cypress/support/component.ts',
+        devServerPublicPathRoute: '/__cypress/src',
+        platform: 'darwin',
+      } as Cypress.PluginConfigOptions
+
+      expect(getSupportFileRelativePath(cypressConfig)).toBe('/__cypress/src/cypress/support/component.ts')
+    })
+
+    it('returns empty string when supportFile is not set', () => {
+      const cypressConfig = {
+        projectRoot: '/users/proj',
+        supportFile: undefined,
+        devServerPublicPathRoute: '/__cypress/src',
+        platform: 'darwin',
+      } as Cypress.PluginConfigOptions
+
+      expect(getSupportFileRelativePath(cypressConfig)).toBe('')
+    })
+
+    it('handles win32 paths with backslashes', () => {
+      const cypressConfig = {
+        projectRoot: 'C:\\users\\proj',
+        supportFile: 'C:\\users\\proj\\cypress\\support\\component.ts',
+        devServerPublicPathRoute: '/__cypress/src',
+        platform: 'win32',
+      } as Cypress.PluginConfigOptions
+
+      expect(getSupportFileRelativePath(cypressConfig)).toBe('/__cypress/src/cypress/support/component.ts')
+    })
+
+    it('uses relative path when devServerPublicPathRoute is empty', () => {
+      const cypressConfig = {
+        projectRoot: '/users/proj',
+        supportFile: '/users/proj/cypress/support/component.ts',
+        devServerPublicPathRoute: '',
+        platform: 'darwin',
+      } as Cypress.PluginConfigOptions
+
+      expect(getSupportFileRelativePath(cypressConfig)).toBe('./cypress/support/component.ts')
+    })
+  })
+
+  describe('waitUntilUrlReady', () => {
+    beforeEach(() => {
+      vi.stubGlobal('fetch', vi.fn())
+    })
+
+    afterEach(() => {
+      vi.unstubAllGlobals()
+    })
+
+    it('resolves when URL returns 200', async () => {
+      const fetchMock = vi.mocked(fetch)
+
+      fetchMock.mockResolvedValue({ ok: true } as Response)
+
+      await expect(waitUntilUrlReady('http://127.0.0.1:5173/__cypress/src/cypress/support/component.ts')).resolves.toBeUndefined()
+      expect(fetchMock).toHaveBeenCalledTimes(1)
+    })
+
+    it('retries until 200 then resolves', async () => {
+      const fetchMock = vi.mocked(fetch)
+
+      fetchMock
+      .mockResolvedValueOnce({ ok: false, status: 503 } as Response)
+      .mockResolvedValueOnce({ ok: true } as Response)
+
+      await expect(
+        waitUntilUrlReady('http://127.0.0.1:5173/ready', { maxAttempts: 3, delayMs: 1 }),
+      ).resolves.toBeUndefined()
+
+      expect(fetchMock).toHaveBeenCalledTimes(2)
+    })
+
+    it('throws after maxAttempts if URL never returns 2xx', async () => {
+      const fetchMock = vi.mocked(fetch)
+
+      fetchMock.mockResolvedValue({ ok: false, status: 404 } as Response)
+
+      await expect(
+        waitUntilUrlReady('http://127.0.0.1:5173/missing', { maxAttempts: 2, delayMs: 1 }),
+      ).rejects.toThrow(/did not become ready in time/)
+
+      expect(fetchMock).toHaveBeenCalledTimes(2)
+    })
+  })
+})