Lollipop Encryption Performance Hit?

[Gekko]

i did not turn on encryption. see below -

Artem Russakovskii
Shared publicly - Nov 12, 2014
#Nexus6
Eek. Quite a performance hit.

Jeremy Camp originally shared:
Nexus 5 16GB lollipop unencrypted speeds vs encrypted speeds. This explains why the Nexus 6's disk speed is so low

https://plus.google.com/+JeremyCamp1337/posts/iDyPjEuEf51

https://plus.google.com/+ArtemRussakovskii/posts/G93J5QELVyj

 

[jj14x]

see this also Nexus 6 review—The “premium” price still comes with compromises | Ars Technica
I was shocked to see this. Having said this, I did play around with the N6 in a store recently and didn't see any noticeable performance issue (compared to my N5 - unencrypted - lollipop). I wonder if the reviews were done with pre-release OS