Is PlayerPrefs still slow?

[This article][1] from 2011 suggests that PlayerPrefs is "really slow on iOS and even slower on Android". Is this still true in 2015 and Unity 5? The post goes on to say: > Most likely, they are doing file I/O operations for every modification. The current PlayerPrefs class is clearly not designed to handle a larger amount of data. Is it also still recommended that content be stored in serialized form? Thanks. [1]: http://previewlabs.com/2011/03/writing-playerprefs-fast/