diff --git a/packages/browser/src/client/tester/tester-utils.ts b/packages/browser/src/client/tester/tester-utils.ts
index c6e72485be33..a32a52fad9d9 100644
--- a/packages/browser/src/client/tester/tester-utils.ts
+++ b/packages/browser/src/client/tester/tester-utils.ts
@@ -186,7 +186,9 @@ export class CommandsManager {
   }
 }
 
-const now = Date.now
+const now = globalThis.performance
+  ? globalThis.performance.now.bind(globalThis.performance)
+  : Date.now
 
 export function processTimeoutOptions<T extends { timeout?: number }>(options_: T | undefined): T | undefined {
   if (
@@ -212,7 +214,7 @@ export function processTimeoutOptions<T extends { timeout?: number }>(options_:
   options_ = options_ || {} as T
   const currentTime = now()
   const endTime = startTime + timeout
-  const remainingTime = endTime - currentTime
+  const remainingTime = Math.floor(endTime - currentTime)
   if (remainingTime <= 0) {
     return options_
   }
diff --git a/packages/runner/src/context.ts b/packages/runner/src/context.ts
index 00dea0a9b3a0..61930382ec41 100644
--- a/packages/runner/src/context.ts
+++ b/packages/runner/src/context.ts
@@ -14,7 +14,9 @@ import { PendingError } from './errors'
 import { finishSendTasksUpdate } from './run'
 import { getRunner } from './suite'
 
-const now = Date.now
+const now = globalThis.performance
+  ? globalThis.performance.now.bind(globalThis.performance)
+  : Date.now
 
 export const collectorContext: RuntimeContext = {
   tasks: [],
diff --git a/packages/vitest/src/defaults.ts b/packages/vitest/src/defaults.ts
index 0c630e25a4cf..734a26caa972 100644
--- a/packages/vitest/src/defaults.ts
+++ b/packages/vitest/src/defaults.ts
@@ -5,7 +5,7 @@ import type {
   UserConfig,
 } from './node/types/config'
 import os from 'node:os'
-import { isCI } from './utils/env'
+import { isAgent, isCI } from './utils/env'
 
 export { defaultBrowserPort } from './constants'
 
@@ -93,7 +93,7 @@ export const configDefaults: Readonly<{
 }> = Object.freeze({
   allowOnly: !isCI,
   isolate: true,
-  watch: !isCI && process.stdin.isTTY,
+  watch: !isCI && process.stdin.isTTY && !isAgent,
   globals: false,
   environment: 'node' as const,
   clearMocks: false,
diff --git a/test/browser/README.md b/test/browser/README.md
index e2896e9bfc0a..f4217a00fb50 100644
--- a/test/browser/README.md
+++ b/test/browser/README.md
@@ -26,5 +26,5 @@ Some test suites don't support running it remotely (`fixtures/inspect` and `fixt
 pnpm docker up -d
 
 # Run tests with BROWSER_WS_ENDPOINT
-BROWSER_WS_ENDPOINT=ws://127.0.0.1:6677/ pnpm run test:playwright
+BROWSER_WS_ENDPOINT=true pnpm run test:playwright
 ```
diff --git a/test/browser/settings.ts b/test/browser/settings.ts
index fc6493cd5cca..c6bb019a38f9 100644
--- a/test/browser/settings.ts
+++ b/test/browser/settings.ts
@@ -5,12 +5,14 @@ import { webdriverio } from '@vitest/browser-webdriverio'
 
 const providerName = (process.env.PROVIDER || 'playwright') as 'playwright' | 'webdriverio' | 'preview'
 
+const wsEndpoint = process.env.BROWSER_WS_ENDPOINT === 'true' ? 'ws://127.0.0.1:6677/' : process.env.BROWSER_WS_ENDPOINT
+
 export const providers = {
-  playwright: (options?: Parameters<typeof playwright>[0]) => playwright(process.env.BROWSER_WS_ENDPOINT
+  playwright: (options?: Parameters<typeof playwright>[0]) => playwright(wsEndpoint
     ? {
         ...options,
         connectOptions: {
-          wsEndpoint: process.env.BROWSER_WS_ENDPOINT,
+          wsEndpoint,
           exposeNetwork: '<loopback>',
         },
       }