LUKS (Linux Unified Key Setup) is a part of dm-crypt which provides encryption for block devices by the Linux Kernel. It is possible to encrypt a whole hard drive or a container which can be stored in a native file system containing unencrypted files.
You will learn how to create such an encrypted container here. Some common scenarios could be to store the container on an cloud service such as (Dropbox, Google Drive, Own Cloud and co.) or to store sensible data own your own devices or at your workplace.
Preadload is a daemon that runs in background of your system just as every daemon does.
This daemon creates statistics of your process and application usage. And that is all that is need for speeding up the start of applications by about 50%.
Preload is one of the applications i usually install right after setting up a new desktop distribution. Die effect on the response time of a system is clearly observable. Everything goes faster an makes much more fun .