There is no speed seperate control on overlockers other than the foot control but most sew at 1500 stitches per minute, very fast compared to sewing machines.
What is your stitch length set to as this could be the problem. For normal four thread stretch seam you would want the length set to beween 2 and 3 so double check this - the length knob is usually a knob on the right side near the flywheel.
Hopefully, the above solves the problem for you but if not, please message again.
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