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Re:Ask HN: Who is using a self hosted analytics system? by pesfandiar on Monday December 05, 2016 @05:30PM (#13110396)
In fairness to Piwik, it was some of the custom metrics that required more processing power. We ended up doing delayed batch processing for them.

Towards the end, IIRC, the calculation of unique visitors within a custom range was also slow.

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