Catheterization of the heart is carried out with a probe having a plurality of electrodes and sensors by displaying an electroanatomical map of the heart on a monitor. During a time interval that does not exceed a duration of a cardiac cycle of the heart the following steps are performed: reading data from at least one of the electrodes and sensors, and invoking a processor to perform an algorithm on the data. The data is one of a plurality of inputs of the algorithm, and the result of the algorithm includes a transformation of the data. The method is further carried out by rendering the result of the algorithm on the monitor to modify the electroanatomical map.