Expo(@expo):"This data is great, but I don't know what most of it means." We heard that a lot. There were over 6,000 people in the Observe beta and we talked to as many of them as we could. At Expo we're all nerds who eat, sleep and breathe mobile dev so it was a bit surprising to us that so many people were unfamiliar with the mobile performance metrics. But it makes sense - and we're glad you told us. We made this simple guide to mobile app startup metrics to explain the meaningfulness of stuff like: TTI, TTR, Bundle Load, Launch Time...ect. Groking these metrics will serve you and your users well.

2026.08.26 10:03

"This data is great, but I don't know what most of it means." We heard that a lot. There were over 6,000 people in the Observe beta and we talked to as many of them as we could. At Expo we're all nerds who eat, sleep and breathe mobile dev so it was a bit surprising to us that so many people were unfamiliar with the mobile performance metrics. But it makes sense - and we're glad you told us. We made this simple guide to mobile app startup metrics to explain the meaningfulness of stuff like: TTI, TTR, Bundle Load, Launch Time...ect. Groking these metrics will serve you and your users well.