GTMetrix is a tool to test the speed and performance of websites. GTMetrix also provides a list of recommended actions for developers to make their websites faster, such as avoiding bad URLs and specifying image dimensions. The GTMetrix REST API allows developers to build their own testing and performance tools based on GTMetrix.
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The GTmetrix .NET Sample Code by Kevin Bronsdijk presents how API interaction can demonstrate performance testing features. Integration tests, test data, and user integration tests are available as resources.