I upgraded to Yosemite on my 27-inch iMac as well as my 15-inch MacBook Pro, and for some reason upon installing the update on my MacBook Pro, I'm presented with a screen asking about FileVault disk encryption. Specifically, I'm being asked if I want to turn on FileVault Disk Encryption, as well as whether or not I want to allow my iCloud account to unlock my disk. Not really sure why I was presented with these questions on my MacBook Pro, but not on my iMac computer, and I'm unclear as to how to proceed? I remember when FileVault first came out a few OS's ago, it was known to slow down your system, which was not ideal for somebody like me who handles lots of video rendering and high resolution image editing in Photoshop. As such, I've not tinkered with FileVault since that time. Should I assume that it's asking me about FileVault on my laptop because it's more vulnerable, being that I often take it out of the house with me on-the-go?... and it is the current release of FileVault in Yosemite still known to slow down your system, or has that been improved? Any suggestions would be greatly appreciated... Thanks!