Hello Edd249, I use a Roland SP540-v for contour cutting. You can control the speed of the cutting two different ways:
1) Using the control panel on the printer itself. In the upper-right corner there is a button called "CUT CONFIG". When you push this button, the first item shown is the FORCE. Use the right arrow button on the control panel to scroll through the other items. You will see "SPEED" (speed of the actual cutting), "OFFSET", and "UP-SPEED" (speed that the tool travels when it's moving from decal to decal). You can use the up & down arrows on the control panel to change the settings for these items. I set the SPEED to 7cm per second. I set the UP-SPEED to 7cm per second also. Going too slow or too fast can cause bad cuts. You'll need to test to find what speed works best for the materials you're using.
2) Using the "Cut Controls" inside VersaWorks. Go to "Cut Controls" in VersaWorks, below the "operations mode" there are some other check boxes available (some will be grayed out). Click on the box that says "enable advanced settings". Once you click the box, it turns ON the advanced settings and you can enter the numbers you want for number of cut passes, the SPEED, the pressure (force), and the offset. When I'm using these settings, I still set the speed to 7cm/second.
In order to get good results, I just cut a few rows of decals at a time. How many to do once depends on the size of the decal, but I find it works best to do small groups/batches. I usually set my decals up so that they take up the full 52" wide, and about 1 foot to 3 feet of length at a time. I learned the hard way that trying to cut 100's of decals, or really long lengths of material at once is a bad idea. Small batches can help you avoid wasting material and time.
Good luck!