Improving the time performance of the TPC clusterer. The idea is to use an auxiliary...

Improving the time performance of the TPC clusterer. The idea is to use an auxiliary array containing the indeces of the timebins with signal above the threshold. The overall speed-up factor in case of zero-suppressed raw-data reconstruction is about 2 to 3. In case of digits reconstruction the gain is about 2. In case of pedestal calculation and subtraction on the flight the gain is expected to be minor or at least the should be no significant performance penalty.