¿Has probado THREAD_PRIORITY_ABOVE_NORMAL ?
Buscando por "SetThreadPriority":
Cita:
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Empezado por Win32's Developer's Reference
When manipulating priorities, be very careful to ensure that a high-priority thread does not consume all of the available CPU time. A thread with a base priority level above 11 interferes with the normal operation of the operating system. Using REALTIME_PRIORITY_CLASS may cause disk caches to not flush, hang the mouse, and so on.
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Quizás tengas que ordenar con un
Repaint
Refresh
Application.ProcessMessages
Application.HandleMessages
si ves efectos no deseados.
Y a las malas.... quizás puedas localizar el programa de Clipper y cambiarle la prioridad
Suerte !!