In the search box, I get suggestions on the fly as I type, and I'm often impressed by the good suggestions. However, right now at Wiktionary I get suggestions that aren't the best ones for the given prefix.
For example, at en.wiktionary.org if I type "lagru" it doesn't suggest"lagrum", but instead a bunch of inflected and derived forms: lagrumshänvisning lagrums lagrumshänvisnings lagrummets lagrummen lagrummet lagrumshänvisningars lagrumshänvisningar lagrumshänvisningarnas lagrumshänvisningarna
Since these are Swedish entries in the English Wiktionary, none of these pages get much traffic. Are the completion suggestions based on traffic stats? In this case, link count might be a better predictor for best suggestion, since all derived forms link back to the basic form.
Not much traffic: 5 page views in 30 days, http://stats.grok.se/en.d/latest/lagrum