Chinese Co2 laser Speed for cutting and engraving is very slow after changing the tube and power supply

This is a LightBurn forum.

Your laser is not connected in the recommended manner that Ruida suggest for a glass tube. That is, you can / should use PIN 5 (the analog signal) for the laser power.

You also need to check that your laser PSU is calibrated to the manufacturer’s electrical current (mA) specifications:

Sounds like the technician changed too many settings while experimenting with your machine. You will need to review all of the vendor settings and check these against your machine’s requirements.