Enabling extended search by default can indeed affect the performance. Use extended search for a control only if we cannot identify a parent control associated with the control uniquely( May be the properties that can be used to identify the control gets changed dynamically at run time). In this case we will try to define the object hierarchy based on a parent control which can be identified uniquely. This is accomplished by enabling Extended Search for the control and by dragging the control just under the parent control that can be identified uniquely. In this case what happens is that TC will try to locate the control at all level below the parent control that can be identified uniquely. This can have an impact on performance. Also we will have problem if we have more than one control having the same set of property any where in the hierarchy below parent control.
