speed of the skirt

Hi,

As i'm getting better at printing, I speed up all the parameters in Slic3r. It is great but I have now another issue. As the bed level calibration was not working, I removed the Z switch and I do a bed leveling at each print . The problem now is that I don't have enough time to do the calibration even with 4 skirts (especially if the part is small).

Do you know if there is a dedicated parameter in Slic3r to slow down the skirt while keeping the printing fast ?

Thanks for your help.

Seb