If you pie using the active viewport; clicking on a Slate button will cause the game pause while the mouse button is down. This does not occur if you pie in a new window. / Kyle

Hi kylawl! This is probably happening because we throttle viewport rendering whenever a user interacts with UI in the editor. It’s a way of shifting priorities to the part of your experience that needs to be most responsive. It seems that we give UI priority in the scenario you describe, so holding…