Happy to support our users and whatever OS they prefer :) We know the OneNote app is a bit slow to load (though recent releases have improved quite a bit!) – unfortunately, it's hard to be as fast as Keep when we do so much more ;) ART and L should bring some improvements, as will using a device formatted with F2FS like the Moto X.
We hope things like this Android Wear release and the (recent-ish) addition of the Recent Notes view to the Android client will make creating those quick on-the-fly notes in OneNote more compelling.
For quickly saving a link, have you tried the OneNote Clipper? You should be able to add the bookmarklet to Chrome or the stock browser and use it to save articles straight into OneNote.
Thanks for using OneNote!