ContributionsMost RecentMost LikesSolutionsRe: Why is gigablast running so slow? Upgraded to Gigablast. Bought the modem at the cox store. Ran a speed test before and after. Its slower than the 3.0 modem. Tech came over and measured of the coax that I was getting the advertised speed. Hooked up my brand new Mac to the modem directly and was showing 150/28. Tech was no help.