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@gbj_tester
You need to provide more information. If you use a design of the same general type as an aluminium one, keep the hoop tension constant and load the material to the same safety factor, them the Ti one will be faster due to superior aerodynamics, but by how much depends on the original speed of the bike. Assuming 50km/h, as all aero tests do in order to flatter their results even though the punters buying this stuff mostly struggle to average 40, then the speed increase is 0.0087%, or around 0.25s in a 25 mile TT. Due to complex mathematics*, slower riders will see larger time gains.
*i.e. the rich people to whom we're trying to flog this stuff are usually fat, slow and desperate for any advantage which doesn't actually involve their getting out and doing some training.