amin, Just released a feature on https://clew.se :Clew: that I've been wanting to make since the beginning: page size indicators! Now 98% of results have an indicator next to them saying the required bandwidth to open the site.
This is accompanied by a sustainability impact rating from A+ to F (based on Sustainable Web Design's digital carbon rating system).
The page size calculation is a bit of an estimate at this point based on some regex and content-length headers, but should be pretty accurate overall. Planning to continue refining this.
Feedback is very welcome!