When “Run Construction Script on Drag” is deactivated we can work with complex blueprints without much lag but when moving a widget from a variable (Show 3D Widget) this option is ignored and the construction script runs every frame. Sometimes we have scripts that runs for some seconds. So it is nearly impossible to place the position exactly.
Hello user37337,
I was able to reproduce this issue on our end. I have written up a report (UE-27383) and I have submitted it to the developers for further consideration. I will provide updates with any pertinent information as it becomes available. Thank you for your time and information.
Make it a great day