In this research, we examined the hypothesis that group performance will increase as a result of accelerating the timing of goal sharing and role differentiation by height of sociality of the group such as social sensitivity and self-regulation. One hundred fifty-six undergraduates (5–7 people×26 groups) participated in consensus-building tasks. After the tasks, they completed the questionnaire about their satisfaction level, social sensitivity, self-regulation, and timing of goal sharing and role differentiation in the group. As a result of the analysis, it was confirmed that the group performance was high in the group with higher social sensitivity and self-regulation. However, the timing of goal sharing and role differentiation was not earlier in the higher social sensitivity group than in the other groups. The process in which sociality influences group performance was discussed.