Test. Optimize. Repeat.

• Stop Test at Document Complete
  Typically, tests run until all activity stops.
• Ignore SSL Certificate Errors
  e.g. Name mismatch, Self-signed certificates, etc.
• Capture network packet trace (tcpdump)
• Save response bodies
  For text resources (HTML, CSS, etc.)
• Preserve original User Agent string
  Do not add PTST to the browser UA string
• User Agent String
  (Custom UA String)
• Append to UA String
• Capture Full Size Video
  Enables full size screenshots in the filmstrip
• Minimum test duration
  Capture data for at least... seconds
• Custom headers
  Add custom headers to all network requests emitted from the browser
• Inject Script
  JavaScript to run after the document has started loading

Chrome-specific advanced settings:

• Capture Lighthouse Report (Uses a "3G Fast" connection independent of test settings)
• Emulate Mobile Browser Motorola G (gen 4) Nexus 5 Nexus 5X Google Pixel Google Pixel XL Google Pixel 2 Google Pixel 2 XL Motorola G (gen 1) Samsung Galaxy S5 Samsung Galaxy S7 Samsung Galaxy S8/S8+/Note 8 Motorola E Android One Nexus 7 Nexus 7 - Landscape iPhone 5C iPhone 6/7/8 iPhone 6+/7+/8+ iPhone X iPad iPad Mini
• Capture Dev Tools Timeline
• Enable v8 Sampling Profiler (much larger traces)
• Capture V8 Runtime Call Stats
• Capture Chrome Trace (about://tracing)
• Trace Categories
  (when tracing is enabled)
• Capture Network Log
• Enable Data Reduction
  Chrome 34+ on Android
• Disable AVIF image support
• Disable WEBP image support
• Disable JPEG XL image support
• Use Chrome dev tools traffic-shaping (not recommended)
• Host Resolver Rules
  i.e. MAP * 1.2.3.4
• Command-line
  Custom options

• Script includes sensitive data
  The script will be discarded and the HTTP headers will not be available in the results
• Discard all HTTP headers

Block Requests Containing (URL substrings)...
Space-separated list

Block Domains (full host names)...
Space-separated list of domains

Simulate failure of specified domains. This is done by re-routing all requests for the domains to blackhole.webpagetest.org which will silently drop all requests.

Hosts to fail (one host per line)...