Martin,
Actually, what Barbara said is that the index on DELETED() may speed things up. Whether there is a gain or loss in speed is a very individual thing and should be tested for each application. The same applies on any index for a field which has only a few discrete values, such as gender.
Note that a proper test involves turning the machine off between tests, due to cacheing.
>As our dear Barbara said, keep an index on deleted()
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