It would be great to have an indication of package size when browsing npm to select a package.
Sometimes a feature can be achieved in a few kb, but you end up with a huge package that goes unused.

One particularly bad example is the jQuery-UI package which comes in at 16mb, and I didn't realise till I was looking through the folder to import just the component I needed. (They bundle many, many versions of jQuery in the package for some stupid reason)