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The ROOT software package is currently being upgraded in several ways to improve data processingperformance. This paper will consider several tools implemented in this framework for calculations onmodern heterogeneous computing architectures. PROOF (Parallel ROOT Package Extension) dividescommon work into small chunks, i.e. packets. The size of the first packet used for calibration, theminimum and maximum set size of the packet, the degree of data structuring affect the speed of theirprocessing. When processing large amounts of data, the read and write speed can be crucial. The newasynchronous file merge feature in the TBufferMerger class allows writing data in parallel frommultiple streams to a single output file. Our calculations show a good scalability of the macroexecution time depending on the number of processor cores used.