Clinton Portis ran a 4.42 40 at the combine, Miller ran a 4.34 40 there
edit: Miller actually ran a 4.40, still faster than Portis
https://www.google.com/amp/s/247sports.com/college/miami/LongFormArticle/NFL-Combine-The-fastest-40-yard-dash-times-for-Miami-Hurricanes-144301011/Amp/