In order I can help you I need more information:
- Where does the slow behavior occur in the movement of the cylinder or in the communication with the OPC driver?
If is first case, what FPS are showed in your system? if you have < 30 you must follow the instructions showed in the page num 21 in the Machines Simulator Instruction Guide.pdf
If is second case, what OPC driver are you using? OPCDriver or OPC_Driver_Enh?