Had an AT&T S4, wiping cache&data was done in a matter of seconds there.
On the N9005, no matter what recovery, wiping data&cache can sometimes take up to 5 minutes. Internal storage, as far as I know, is healthy, when using USB 3.0, copying 1.7 GB file to the phone took less than 20 seconds, installing apps and opening them is fast.
But the wiping sometimes takes more time than flashing the ROMs themselves.
Is this normal for the Nope 3, or is my phablet special? xD