Why is TV cable faster than Internet cable?

On our TV, I can go channel to channel quickly, even through the HD channels quickly, but streaming video on the cable internet is incredibly slower to do in comparison. . Both services work through the same type of cable coax line. Could somebody mind explaining?

>>2
Yeah but what about on demand/ PPV services that some cable companies provide? And interactive TV services? I have both and use both. The stuff isn't braodcast at the same time to everyone.

HUH? HUH?