One of the biggest pet peeves of a Nexus owner is the inability to make their own choice when it comes to their phone. This is exactly the case with Encryption on the new Nexus 6 and Nexus 9 with Lollipop. Encryption is enabled by default with no option to disable it. This has been reported to slow down the Nexus 9 and Nexus 6 considerably. With a bit of know how you can actually disable this "feature". Our very own "rhcp011235" has put together a full in depth guide on how to disable force Encryption on the Nexus 9. You will need root and a root file explorer to modify the boot.img. Head to the link below for the full guide.
[GUIDE] How To Disable Force Encrypt To Speed Up Your Nexus 9