iPhone and iPad owners adopted Apple’s iOS 10 at a slower tempo during its first dozen days than they did last year’s upgrade, according to data from an analytics vendor.

At the 12-day mark, iOS 10 accounted for 41.9% of all iOS editions detected by Mixpanel, whose metrics platform is widely used by mobile app developers to track usage and user engagement.

That was significantly lower than the 52.4% accumulated by iOS 9 last year at the same post-release point, but slightly higher than iOS 8’s 40.6% in September 2014.

The modern record for iOS uptake was in 2013, when iOS 7 — a major overhaul of the operating system’s user interface (UI) and user experience (UX) — captured a 65.5% share in its opening 12 days.

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