Apple’s new OS X Yosemite now powers about one in five Macs, an uptake rate that surpassed last year’s Mavericks in first-month adoption speed, analytics company Net Applications said.

For October, Yosemite accounted for 19.4% of all instances of OS X tracked by Net Applications, which estimates operating system user share by tallying visits to the websites operated by its clients.

In comparison, OS X Mavericks, Apple’s 2013 upgrade, ended October of that year with a Mac-only user share of 10.9%.

The difference was probably due to Yosemite’s head start — unlike Mavericks, Yosemite was seeded to about one million users in a first-in-14-years public beta program — as well as its earlier release in the month. Yosemite appeared on Oct. 16, six calendar days before Mavericks, which debuted Oct. 22, 2013.

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