Si el componente que estás creando desciende de la clase TwinControl, lee esta ayuda de Delphi:
Cita:
Determines whether the control’s image is rendered directly to the window or painted to an in-memory bitmap first.
property DoubleBuffered: Boolean;
Description
When DoubleBuffered is False, the windowed control paints itself directly to the window. When DoubleBuffered is True, the windowed control paints itself to an in-memory bitmap that is then used to paint the window. Double buffering reduces the amount of flicker when the control repaints, but is more memory intensive.
When a windowed control is a dock site and has an associated dock manager, it must be double-buffered.
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Un Saludo.