Hi, <<...
There is nothing out of normal among your parameters. The synchronize option you selected is going to make the method wait until the operator interface process the message. So it depends on what you put in your UI message event handler. I'm not aware of anything related to this method itself that could cause this slow execution behavior. If you could send us a simplified version of the project, maybe we can further investigate the issue.
Song D
Regards,
Song Du
Systems Software
National Instruments R&D