I have a 2015 13" Macbook Air with 4gb ram, and a new battery running, Mint with i3 wm and except for a few very unoptimised webpages I don’t experience any significant lagg when browsing. streaming 1920x1080 video without issues(the screen resolution is 1440x900 so no need for more) sure I only use it for writing on the go and minor surfing, anything heavier like video editing or Blender I do on my main desktop or my lenovo legion. This whole - anything less than 16gb ram is garbage in current year. Does not take into account that a lot of consumers and middle managers actually don’t do anything heavy on their computers.