Fastest Solr query

[Lance Norskog]

The fastest solr query I can find is any query on unused dynamic field name:
unused_dynamic_field_s:3 
Is there another query style that should be faster?
 
See this line in http://wiki.apache.org/solr/SolrConfigXml

    <pingQuery>q=solr&amp;version=2.0&amp;start=0&amp;rows=0</pingQuery>

A better ping query would be 

        q=unused_dynamic_field_s:3
 
Thanks,
 
Lance