这要花很长时间……我怎样才能把这本字典加速?(python)

    meta_map = {}
    results = db.meta.find({'corpus_id':id, 'method':method}) #this Mongo query only takes 3ms
    print results.explain()
    #result is mongo queryset of 2000 documents

    count = 0
    for r in results:
        count += 1
        print count
        word = r.get('word')
        data = r.get('data',{})
        if not meta_map.has_key(word):
            meta_map[word] = data
    return meta_map
    meta_map = {}
    results = db.meta.find({'