Lubuntu is a fast and lightweight operating system that is light on resources yet very responsive to user interaction. Lubuntu is based on the LXDE environment, uses Pcmanfm to manage files, and the Openbox window manager.
I did a basic set up of Lubuntu in Virtual Box with 512 MB of Ram running solely off an ISO image. I was impressed with the speed and responsiveness. Many distros make the claim they work well on older machines with limited resources, but Lubuntu is also a distro that is very responsive to user input. I call this the "real time" effect, in which user interaction is not delayed but occurs in real time.
I love Pcmanfm as a file manager. A few years ago I had MATE set up in Linux Mint 13 and replaced the default file manager with Pcmanfm. It was very fast, and now Pcmanfm is updated to version 1.2.0 with new features such as folder settings, dual pane view, and menu editing.
I also liked the Lubuntu Software Center. I tend to use Software Centers rarely, but in those circumstances I do, my biggest irritation are them being slow and sluggish. The Lubuntu Software Center was more responsive than most, and one I would not mind being included in Linux Mint itself.
Before we get to the video review, one advantage of these low resource distros is they don't take any more juice than many programs running on a desktop. I know my even my browser takes more than 512 MB to do its job. Lubuntu is definately a light weight distro I will set aside a virtual hard drive for in Linux Mint 17 Cinnamon.