In fact, even on moderately complex inputs, the generator quickly runs into a combinatorial explosion, having so far prevented the grammar from being usable for any serious real-time NLG tasks.
upon closer inspection of the source of the inefficiency, it became quickly apparent that the observed performance problems are the result of a conspiracy of several factors, most of which can be subsumed under the notion of non-configurationality: • Relatively free constituent order to English, constituent order in German clauses is relatively free, permitting permutation of complements, including the subject, as well as interspersal of modifiers in pretty much any position.