I spend a long time to optimize the settings in slic3r (0.9.10b). You can find the configuration file for download below.
Important adjustments are
In repetierhost the speed now can be increased by moving the slider for speed control up to 200% or even 300% without much loss of quality depending on the object you are printing.
slicer 1.0.0RC2 available!
configuration files for ABS and PLA in download section