Profiling

Profiling tools help you identify performance issues in real-time.

• WebPageTest
  Extensive frontend analysis with SpeedIndex calculation.
• GTmetrix
  Compare PageSpeed + YSlow profilers.
• Google PageSpeed
  Test Google’s optimization rules.
• Yahoo YSlow
  Test Yahoo’s optimization rules.
• Website Test
  Basic profiler from Yottaa.
• ByteCheck
  Type a URL to check connection timings and TTFB.

Monitoring

Monitoring tools help you identify performance regressions and trends over time.

• SpeedCurve ($39/mo)
  Automated WebPageTest tracking with competitor benchmarking.
• Calibre (from $29/mo)
  Automated frontend tracking with SpeedIndex.
• NewRelic Browser (free, from $99/mo)
  Frontend performance + RUM, paired with other NewRelic products.
• Pingdom (free, from $10)
  Uptime and performance monitoring with RUM.