Task not appearing in Tasks tab immediately

We have seen that for few workflows the tasks assigned to the group are not appearing immediately in tasks tab. when checked in instance, it shows assigned to group but doesn't appear in tasks tab. sometimes, we see the task in a min or takes 30+ min to appear on the task for that user who is part of the group. how much it would impact if there are more no. of users (100+) have assigning of the task?

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