Basically what’s happening here likely has to do with the fact that the browse opc function parses through the entire tree of devices and tags on the system before being able to filter the list down to just the device you want. If you disabled your other devices in your gateway and then tried to browse your device again the script would likely finish without error. Unfortunately right now there is no workaround for this, but there are some changes being made for 7.7 which should make this browse functionality better in cases of browsing systems with multiple devices connected.