Here are some possible positive connotations depending on the context:
For physical height:
* Petite: Suggests a delicate, dainty, and graceful appearance.
* Compact: Implies a sense of efficiency and being well-proportioned.
* Sturdy: Can imply strength and resilience.
For time duration:
* Brief: Can suggest a sense of efficiency, conciseness, or quickness.
* Concise: Implies clarity and directness in communication.
* Snappy: Can suggest something lively and energetic.
For length of something:
* Compact: As with physical height, suggests a sense of efficiency and being well-proportioned.
* Tight: Can imply a sense of control, precision, or focus.
* Crisp: Suggests clarity and a sense of cleanness or freshness.
For other situations:
* Direct: Can be used to describe a person who is straightforward and to the point.
* To the point: Implies clear and effective communication.
* Sharp: Can suggest intelligence, wit, and a quick mind.
Ultimately, the positive connotation of "short" will depend on the specific situation and what you are trying to convey.