Hi everyone! I’ve just connected GrowthBook and launched the first AA test in the staging environment! 🚀 I’d really appreciate your help with a few questions. We’re currently using Mixpanel as the data source. My concerns: • The Experiment Started event only appears after the Start event, but I need it to trigger beforehand. This seems related to the GrowthBook API loading time. However, we don’t want to sacrifice page loading speed. Any ideas? • The Experiment Started event appears twice per user — once after the Start event and again after the Age Choice event (which is also the goal metric in this experiment).

Congrats on the A/A test! We'll likely need more info on you've implemented Mixpanel to give you a clear answer, but here's some likely things to check: 1. Experiment started fire after start is likely means that the GrowthBook trackingCallback is firing before your analytics tools are fully ready. There's some kind of sequencing check that needs to happen. 2. Experiment started shows up twice means that the trackingCallback is likely running more than once per user. Look for ways that this callback might be fired twice. Also, please note that we don't recommend using Mixpanel as a direct datasource. Mixpanel themselves has placed this in maintenance mode. It means our integration is limited and may break in the future. It's better to set up an export of Mixpanel data to a data warehouse. More details here: https://docs.growthbook.io/guide/mixpanel