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Effectively capturing opportunities requires rapid decision making. We investigate the speed of opportunity-evaluation decisions by focusing on firms’ venture termination and venture advancement decisions. Experience, standard operating procedures, and confidence allow firms to make opportunity-evaluation decisions faster; we propose that a firm’s attentional orientation, as reflected in its project portfolio, limits the number of domains in which these speed-enhancing mechanisms can be developed. Hence, firms’ decision speed is likely to vary between different types of decisions. Using unique data on 3,269 mineral exploration ventures in the Australian mining industry, we find that firms with a higher degree of attention toward earlier-stage exploration activities are quicker to abandon potential opportunities in early development but slower to do so later, and that such firms are also slower to advance on potential …