I was able to get a 99 on my portal page, so it IS possible. Through its recommendations, I enabled and setup mod_deflate and far future expiration in Apache. I also minified ubbt's js files. Sure the minification saved just a little bit of size, but every little bit helps. mod_deflate was able to shrink my portal page by 75%. UBBCentral uses it to shrink theirs by 90%, so as you can see, it's a great thing to use.
