Ranked in these QuestionsQuestion Ranking
Pro Extremely lightweight
Jwm is a lightweight window manager that is used as the default window manager in Puppy Linux, a lightweight distribution that can be loaded from RAM.
Pro Great for older machines
Jwm is very easy on your GPU, making it very suitable for older machines that can't run other options quite as well.
Con Unattractive default theme
The default theme for jwm is not very visually appealing (though there are many themes available for users to change it as they please).