There are a considerable number of different terms covering web performance and performance load testing. The glossary provides a single reference point for as many as we can identify.
Accelerated Mobile Pages
Accelerated Mobile Pages (AMP) is an industry-led open source initiative to deliver web pages to mobile-connected devices faster.
Data Start Time
Data start time | an important web performance calculated from metric timing points made available through the W3C's Navigation Timing API
Navigation Timing API
Navigation Timing API | Endorsed by the W3C it provides a software-based interface that provides timing-related data for websites and applications.
Real User Monitoring
Real User Monitoring (RUM) | collects real-time performance and availability data about each interaction a visitor to your website has with a view to understanding and reporting on customer experience
RUM | an acronym for real user monitoring which collects performance and availability data on the customer experience of a website visitor.
Synthetic Monitoring | regularly monitors a website or other online service regularly, with a view to reporting on performance and availability
Time to First Byte
Time to First Byte | an important web performance metric measuring how long it takes to deliver the first byte of a web page