WebPageTest
WebPageTest is an open-source website performance testing tool. It allows users to test website load speeds from different locations around the world and provides performance metrics like First Contentful Paint, Speed Index, and Time to Interactive.
performance
load-testing
open-source
WebPageTest: Performance Website Testing Tool
WebPageTest is an open-source website performance testing tool. It allows users to test website load speeds from different locations around the world and provides performance metrics like First Contentful Paint, Speed Index, and Time to Interactive.
What is WebPageTest?
WebPageTest is an open-source website performance testing tool developed by Google. It allows users to test the load times and performance of any website from locations around the world. WebPageTest measures vital web performance metrics like:
- First Contentful Paint - When the first bit of content renders on the page
- Speed Index - How quickly the visible parts of the page are displayed
- Time to Interactive - How long before the page responds quickly to user input
Some key features of WebPageTest include:
- Testing from over 300 locations globally to simulate real user experiences
- Advanced connectivity options like 3G, Cable, and LTE
- Waterfall charts showing resource loading over time
- Filmstrip view to visually see rendering progress
- WebPageReplay to test cached vs uncached performance
WebPageTest produces rich test reports with performance data and suggestions to help debug and optimize site speed. The open-source codebase allows running a private WebPageTest instance as well. Overall it's one of the most advanced tools available for free website performance testing.
WebPageTest Features
Features
- Website load speed testing
- Waterfall charts
- Video capture
- Content breakdown
- Custom metrics
- Scripting
- API access
Pricing
- Freemium
Pros
Free and open source
Wide range of detailed metrics
Global testing locations
Easy to use interface
Flexible customization
Cons
Can be resource intensive
Limited testing frequency on free tier
Setup requires some technical knowledge
Official Links
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