Subject Name Performance Considerations When designing subject name conventions, remember these performance considerations: • Shorter subjects perform better than long subjects. • Subjects with several short elements perform better than one long element. • A set of subjects that differ early in their element lists perform better than subjects that differ only in the last element. • With certified delivery and distributed queue features, the cost of storage and accounting varies according to the number of subject names. We strongly discourage embedding one-time tokens (such as timestamps) within such subject names, because they can result in unbounded growth of storage and accounting costs. Instead, embed such one-time values within message fields.
