Analyse Third Party Impact

The Third Party report helps uncover the impact of third party code, services and tools on performance and user experience. Third Party reports are available for each Snapshot test taken for a Site. This article explains how to access and analyse Third Party reports.

View Third Party reports

Navigate to a selected Snapshot → Third Party tab.

Third Party report showing number of third-party providers, transfer size and main thread execution time. It compares transfer size and execution time across third and first party resources. Also, it breaks down both based on categories of third parties, listing specific tools and services.

Inspect which categories of tools take up most bandwidth and which providers are the worst performance offenders. You can sort third parties by provider, category, transfer size and execution time in the table at the end of the report page.

Each report highlights the number of detected providers, how they contribute to page transfer size and JavaScript main thread execution time and what is the split between first and third party transfer size and main thread execution time.

Track changes in Third Party metrics

Third Party metrics behave like any other metric tracked in Calibre. You can keep an eye on changes to third party-related metrics over time on Pulse report, Pages Leaderboard or set Budgets against them.

Charts portraying changes to Third Party metrics: the number of third party providers, total third party main thread execution time and code transferred, over time.

Block Third Parties in Test Profiles

To benchmark the impact of third parties and find better alternatives, you can turn off selected providers in Test Profiles.