Crittercism, which sells mobile app management technology, gathers intelligence from its deployments to help it get a feel for software rollouts and performance.
It says the crash rate for those downloading early versions of iOS 9 -- which promises improved switching between apps, power-saving features and split-screen mode for newer iPads -- has been less than that for iOS 8, and the company expects a 31% adoption rate over the next week. That's actually a little slower pace than for iOS 8, and Crittercism explains this is because "public perception of upgrading has been a bit tarnished and users are becoming more cautious about upgrading."
However, Crittercism expects the public to cast such caution aside before long, and that 50% adoption will take place by Day 25. It took 28 days for iOS 8 to hit that mark.
The stinger for rival Android is this: Crittercism expects iOS 9 adoption to hit 20% by Sunday, and that's equal to Android 5.0 (Lollipop) adoption some 11 months after that software hit the market.
(Among others tracking iOS 9 adoption is analytics firm Mixpanel (see early adoption chart here). CEO Suhail Doshi expects a pretty fast adoption rate for iOS 9.)