Production speed scaling due to hatches. If you want 6 carriers at the same time, build 6 starports. If you want 6 ultralisks or 6 mutas at the same time, bui

Production speed scaling due to hatches. If you want 6 carriers at the same time, build 6 starports. If you want 6 ultralisks or 6 mutas at the same time, build 2 hatches (which you already have) One consequence of this is that changing army composition as Z is very easy.