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TestEngineering/Performance/Glossary: Difference between revisions
TestEngineering/Performance/Glossary (view source)
Revision as of 14:09, 14 August 2020
, 14 August 2020Redirect to performance glossary
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#REDIRECT [[Performance/Glossary]] | |||
{{DISPLAYTITLE:Glossary}} | {{DISPLAYTITLE:Glossary}} | ||
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Some tests will post results in a small range, and when we get a data point significantly outside the range, it is easy to identify. | Some tests will post results in a small range, and when we get a data point significantly outside the range, it is easy to identify. | ||
The problem is that many tests have a large range of expected results. It makes it hard to determine what a regression is when we might have a range += 4% from the median and we have a 3% regression. It is obvious in the graph over time, but hard to tell until you have many future data points. | The problem is that many tests have a large range of expected results. It makes it hard to determine what a regression is when we might have a range += 4% from the median and we have a 3% regression. It is obvious in the graph over time, but hard to tell until you have many future data points. | ||
== Perf Sheriff == | == Perf Sheriff == | ||
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== Time To First Interactive (ttfi) == | == Time To First Interactive (ttfi) == | ||
This is a newer metric and reports when the page is first expected to be usable and will respond to input quickly (with the possibility of slow responses as more content loads). | |||
# Start looking for First Interactive at first contentful paint | |||
# Look for the first interactive window (with no regard to in-flight requests) | |||
# First Interactive is the start of the interactive window from step 2, first contentful paint or DOM Content Loaded, whichever is later | |||
== R/b == | == R/b == | ||
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== WebPageTest == | == WebPageTest == | ||
Accurately measure, track, and report on key Firefox-performance metrics, over time. | |||