I created some bootcharts for a recent rawhide snapshot (Apr 9th),
comparing the new gdm early login with rhgb:
1. Early login definitely helps. Apart from the fact that gdmgreeter
shows up ~20 seconds earlier, there's also a ~10 second net gain in boot
2. readahead is not installed by default. I'm not sure if this is
intentional, but the new package is not listed in comps.xml (FC3 carried
it in kernel-utils). Is this due to bug 128444, waiting for a better
readahead file list update mechanism? I tried booting with readahead
installed, but it didn't improve the times.
3. rdisc (router discovery) could check for an actual network connection
and fail if none is available. In my wireless NetworkManager setup (no
network during boot) it wastes 6 seconds.
4. I had to disable kudzu and blacklist the ipw2100 module because it
was taking 10 seconds and failed to load the firmware during boot: