When it was still based on QtWebKit (and named QupZilla), it had relatively little overhead, so it was a better choice for low end PCs than fully featured browsers. My guess is that those descriptions are a leftover.
@Yora@woelkchen most people do not look beyond the UI. Unfortunately writing a pretty UI is the easy part of writing a browser. Maintaining some browser engine is much harder.
So make sure to use a browser with an engine backed by as big an open source project as possible and one where the browser engine has as few downstream patches as possible.
Wrapping the entire engine in a new set of APIs not available upstream involves way too many downstream patches for my taste.
And yet, when Qt Company still made QtWebKit, instead of using the stable branches Apple used for Safari, they made releases from svn trunk and then tried to stabilize it with a small team. No idea when Qt Company keep trying to make a browser module for so long and keep failing all the time…