Increasing selection speed in Blender
Blender since version 2.80 has experienced a significant slowdown in objects selection in the viewport. This becomes visible when we quickly click in turn on several objects. The selection lag is sometimes so long that some of the clicked objects will not be selected. The cursor has already moved to the next object, and the selection of the current one still did not happen.
The selection delay occurs because by default Blender has the “Box Select” mode enabled in the T-toolbar.