UBB sits all the posts in one table, thats what i thought you where refering to, cause you know as well as I that we both had to split the posts up back in the day

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Anyway, vB 2.x.x sits all the posts on their own tables stock, this is why they load one by one (if your connection is slow enof

) Of course this can be modifiyed

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Also, vB 3 puts a table around all the posts, thats why it 'feels' like a longer wait when loading threads on a vB 3 beta forum.
Keep in mind that the current vB 3 template set is not finished.
..to answer the question raised:
Stock vB's do this by default, you have modifyed your style/your pre made style has been modifyed. You will have to re code it to allow all posts to have their own table (postbit template).