I tore out some more kernel modules from my MODULES=() line in /etc/rc.conf, but it didn’t do much to improve speed. My module list is now
MODULES=(snd-pcm snd snd-nm256 soundcore cdrom serio_raw psmouse evdev pcmcia pcmcia_core ieee80211_crypt hermes hostap hostap_cs orinoco orinoco_cs rtc rsrc_nonstatic yenta_socket i2c-piix4 i2c-core usbcore usb-storage usb-uhci)
Things like ata_piix and ata_generic didn’t do anything to prevent the machine from booting, as I had feared they might. I can still stream audio without snd-page-alloc and snd-timer. And since the MagicGraph 256AV is a PCI card, it didn’t seem to matter if I had agpgart or intel-agp inserted. I was right.
The only detriment I can see so far is that I seem to have lost my USB ports; or rather, the USB flash drive I have in there doesn’t seem to be responding to fdisk -l. I haven’t decided if it’s worth tracking down or not, since I hardly use it. I’ll think it over.
For now I’m still trying to dig up some dirt on getting X to start quicker. After that, about the only tweak I can think of to improve the speed would be a custom kernel. If I have to go to that route, I’ll save it for last.
Edit: Adding sd_mod solved my USB disk problem. 
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