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Why Are Experiment Viewed Counts Lower in Segment Than in Optimizely?

Question

Why do I see fewer Experiment Viewed events in Segment and other downstream tools compared to the number of unique visitors reported in Optimizely?

 

Product

Twilio Segment

 

Answer

The count of “Experiment Viewed” events may be slightly lower compared to the number of unique visitors seen in Optimizely because Optimizely loads synchronously and Segment loads asynchronously. This means that if the user quickly closes or redirects from a page, sometimes Segment does not have enough time to scrape the experiment data from the global Optimizely object and make its API calls back to Segment and to your other enabled tools.

 

Additional Information

Learn more about Segment Optimizely Integration in Optimizely Web Destination.

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