Originally Posted by betterdan
9 * 48 ms 51 ms po31.dsr01.dllstx4.theplanet.com [188.8.131.52]
Other than that line nothing looks too out of the ordinary (although that router also seems to be slower than the others in general, but not excessively so). The * instead of a ping means that it didn't respond on that check though. Since it only happened once I wouldn't expect it to cause a chronic problem like this though.
Does VBulletin have the option to add the "Page generated in blah ms" to the bottom of pages? If it does and MikeC could turn it on then when the site is slow it would tell us for sure if the server is overloaded at those times.