Lubuntu, Xubuntu, CrunchBang, Peppermint, and Puppy Linux are some of the top lightweight Linux distributions that can run well on older computers with low system requirements. A lightweight distro uses few system resources and focuses on speed and efficiency. Lubuntu and Xubuntu use the LXDE and Xfce desktop environments respectively, keeping their requirements low. CrunchBang offers a modern Debian system without sacrificing performance using the Openbox window manager. Peppermint is based on Lubuntu but is cloud-centric, while Puppy Linux can run entirely from RAM.
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