viscous drag is over-rated in grease performance. It's irrelevant to most riders.
It's not, I guarantee you it's not. I made once a colloidal suspension of lithium grease in some special solvent (although this is not a real solute, but a sol) and used that on my chain. Worst and funniest mistake I ever did. I posted the story somewhere but thanks to bikeforum's broken search engine, I can't find it. Anyway, it was like riding through molasses.