18mb down and 3.8 up from that site. Sometimes it spikes though. Hard to get an accurate reading.
Are you measuring this with a reasonable fast PC plugged straight into the ZyXEL modem/router?
Those particular tests weren't, but I've done it before to the same results. Perhaps only slightly faster.
»dl.dropbox.com/u/10970841/router.pngStatistics from my router. Does anything look off?