Right now, for me, using Safari 4 in OS X...
http://www.google.com loads six files. One is a 9.6 KB main HTML, then there are the 8.4 KB and 5.3 KB images, and finally a 51.9 KB JavaScript file. That's probably the holdup, you're waiting for that JavaScript to load every time.
68kmla.org/forums/search.php?search_id=newposts returns 23 files. One is a 34.1 KB HTML, then a 9.7 KB stylesheet, and a bunch of images, one 6.0 KB (the main logo,) one 2.1 KB (the PayPal donate,) and a bunch of less-than-1.0 KB mini images.
So the raw text data, before pictures, is 61.5 KB for Google, and 43.8 KB for 68kmla. Not a surprising result then. Even adding up all the small 68kmla pictures, the whole page is still smaller than Google.
I bet if you disable Javascript, Google will be lightning fast. (But then you get an uglier version of google.com.)
edit: Yup, turning off Javascript, and all Google loads is its 9.5 KB HTML, and 8.4 KB GIF. The 68kmla new posts page still returns its 34.1 KB HTML and 9.7 KB CSS, plus pictures.