Is manjaro a lightweight?

Manjaro is lightweight with it’s environment. I prefer to use XFCE. Unity is really heavy and could be laggy sometimes. But you will feel the smoothness when you use XFCE.

What is manjaro Linux good for?

Manjaro is a user-friendly and open-source Linux distribution. It provides all the benefits of cutting edge software combined with a focus on user-friendliness and accessibility, making it suitable for newcomers as well as experienced Linux users.