Hum,
Very slow moving Darkmatter could possibly have accumulated in the interior of the Sun.
This would result in the Suns density being higher than it should be, and there is a possibility (though unlikely) that it would have a cooling effect on the interior solar temperature and associated effect on the fusion processes.
The higher density may lead to perturbation effects on the orbits of the planets.

I have seen computer simulations that require some cold dark matter to explain the origin of the large scale structures seen in the universe today. But, most of this slow moving dark matter would now reside in galactic blackholes, imho.

The darkmatter halo may consist of slow/relativistic moving particles (at least 9 km/s) .
This is moving slow enough to be gravitationally bound to a cluster of galaxies, (or the matter bound to the DM) etc

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`Irony` actually does mean `metal like`...