Default Upgrading OS makes the device go slower?

Hey,

Coming from an iPhone 4 that got significantly slower each iOS upgrade (4 was fine but it gradually became unusable until iOS 7), I'm assuming it's the same thing with Android? It's just that the new OS is optimized to faster devices, on average.

Also do you think that's the case even with mini upgrades, just to a lower extent? (i.e. from 4.3 to 4.4)


Thanks.