We has confirmed that there is no delay when oCam-1CGN-U-T is used in a ROS environment with a trigger signal of 10 Hz.
After setting the trigger board to internal synchronization mode and pulse cycle of 100ms, using its ROS package as it is, the average is 90ms.
(We are using ROS Noetic, and our computer's running Ubuntu 20.04 LTS.)

Please check the following two cases.
1. When the trigger mode is operated in asynchronous mode rather than a synchronous mode
2. If you do not use the ROS package provided by your company, or if you use it after modifying it
- WITHROBOT's ROS Package Link: https://github.com/withrobot/oCam/tree/master/Software/oCam_ROS_Package