Fatdog64 has the potential to serve as an alternative lightweight OS to Linux distros such as Puppy Linux, Knoppix and Zephyr. However, it has some critical usability issues that need to be fixed first. Fatdog64 seems to have lost its performance edge over earlier versions that made it more appealing as an alternative “frugal” Linux candidate. The numerous Puppy Linux derivatives and Knoppix have solid reputations for fast and efficient performance on older, less powerful desktop and portable computers.
From: Linux Insider