You have the option to define a condition to run against objects of a given class definition to filter them before they are returned to the client. The use of conditions to filter results works well with small data sets, but does not perform well on larger sets of data. The condition is run on every object in turn. If the condition involves relationship/edge expansion, the process might be slowed substantially.
Query conditions should be employed only where the result set has already been limited
to a small set of data by property comparisons on the find method.