Firevault: "Your homefolder is using more space than required"
Thank you for the help.
Unless you have a need for military-level security, FileVault is overkill. It slows your computer because all sorts of cache and preference files are repeatedly encrypted and decrypted, and because filevault is saving all your files in a big "container file," disk and directory errors that would otherwise be minor can cause massive data loss on a filevault-ed computer.
To keep SOME files secure, an encrypted, password protected disk image is a better idea. You can make encrypted disk images with Applications/Utilities/Disk Utility. Do File > New > Disk Image from Folder.