Speedometer ksplash theme.
This ksplash shows loading icons as many of ksplash themes, AND the speedometer on the left displays the loading time of your KDE in seconds. It's more a chronometer, in fact .
Well, you can use it with the associated kdm theme:
Archive is .tar.gz (2.91Mo).
Install throught control center or extract in ~/.kde/share/apps/ksplash/themes