Performance Issue: gantt.open() is very slow, even with few children

[Zaki_Z]

Hello,

I am experiencing a significant performance issue with the Gantt chart. When I try to expand a task to show its children by calling gantt.open(taskId) which calls the event onItemOpen, the UI freezes for about 3 seconds before the child tasks are displayed. See the attached GIF.

The latency is inside gantt.open() : I placed a breakpoint on the line gantt.open(taskId) and another one right after it. The entire 3-second delay happens within this single function call.

Does anyone have an idea what could cause this ?

Thanks.