"High geared" is an idiomatic expression that refers to something that is set up to work efficiently at a fast pace or with a high level of activity. Synonyms for "high geared" include "fast-paced," "productive," "efficient," "energetic," "dynamic," and "vigorous." If you're describing a workplace, you might use "fast-moving," "goal-oriented," or "progressive." For a person or team, "ambitious," "driven," "focused," or "result-oriented" could work. Alternatively, you might choose to emphasize the level of activity with words like "hectic," "frantic," or "busy." Regardless of the context, using one of these synonyms can help convey a sense of urgency and drive.