but it really isn't. Aside from the glaring differences (Siri), I don't even see much difference from El Capitan. Some tasks are even faster.
My system specs:
-- 21.5" iMac Mid 2011, Core i5 2.7GHZ, 16GB Ram, 1TB 7200RPM traditional hard drive (75% free space),
AMD Radeon HD 6770M 512 MB video...