Depends on how the chef runs the place. Indian food is difficult if one sticks to western notions of "made to order", each meal being started only after ordering. But a curry house will prep things like the curry base before opening, doing maybe 75% of the work before the first orders arrive. Then it goes quickly. In western cooking the skill is in the actual cooking, with indian food the skill comes in the non-cooking prep work.

Restaurant indian food is made in batch though. The food tastes just as fresh and often tastes better after the spices have had time to settle.