I've hand-waved it as a purely optical effect caused by the warp field. You're seeing the same 50 or so stars "woosh" by over and over again as the warp field flings the ship along.

__________________

New! It combines the power of science with the gentleness of your mother's best intentions!
A new miracle technique, we apply homeopathic methods to achieve scientific efficaciousness
for dilutions WAY beyond Avogadro's Limit. It's New! It's Fresh!
It's Placebo^[tm] Brand Power Drink! *[Use as directed. May increase kidney function.]