Query names produce overhead, since CQP has to manage the results which are associated with these names. Therefore, at times, it might make sense to remove query names from the CQP working memory. E.g. for the query names Q1 and Q2, this is done by the command
discard Q1 Q2;
Note that this only deletes the information about Q1 and Q2 from the CQP working memory, but it does not delete any saved query results (see section C.1) from your hard disk.