No sampling is used in the solution. This is true both during collection and during analysis. We take advantage of our powerful infrastructure to provide you with results on all of your data without impact on performance.
The optional eco-mode is not sampling either: when enabled, it still processes all of your data, but uses a statistical approximation to estimate deduplicated counts (such as Visitors and Visits) in order to reduce computing resources and carbon footprint, with an average error under 2%. You can disable it at any time for exact figures. See Eco-mode for details.