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Problem with OpcUaClient SmartComponent in RobotStudio

The OpcUaClient SmartComponent cannot take too many signals otherwise the speed of RobotStudio will be greatly damaged.

On a project with 90 PLC signals connected by using OpcUaClient, we find that RobotStudio simulation running in a very slow way and the graphic becomes inconsecutive. One second in real time corresponding to more than ten seconds in RobotStudio simulation. Different PCs been tested, the situation remains the same. When signal number is reduced to 30, simulation becomes more smooth.

So what is the wrong with OpcUaClient SmartComponent?