Machine will not sew fast
Have you performed any recent cleaning and oiling? If not, that is probably the basis of your problem. The machine is seizing because the lubrication has dried and is preventing the parts from moving.
Consult your owner's manual, use ONLY fresh good quality sewing machine oil and apply 1-2 drops each place as instructed in the manual.
If your machine is mechanical, you can open the top and bobbin area, gently hand rotate the handwheel toward you, and watch where metal rubs on metal and apply 1-2 drops of oil each place. Do NOT oil plastic, belts, or decorator stitch cams. Then SLOWLY run your machine to get the oil distributed. It should loosen up after the machine has run for a few minutes.
You should oil the hook/shuttle every time you install a new bobbin, do a complete cleaning and oiling every 40 hours of sewing time or (if the machine is in storage) every 6 months.
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