property RepaintMode: TRepaintMode;
type TRepaintMode = (rmFull, rmDirect, rmOptimizer);
This property controls the way repaints of the contents are handled by TCustomPaintBox32 and its descendants:
rmFull - indicates whether always to repaint everything;
rmDirect - indicates to use a direct repaint rather than a deferred invalidation. Please note, that this mode is not supported for layer supporting control like TCustomImage32 and its descendants;
rmOptimizer - indicates to use the repaint optimizer to just repaint changed areas. Especially layer operations benefit from this mode.