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What is the fastest way to get access to hdf5 results data?

Currently I am using res_utl_extract_nodal_results to extract the result. But in case of huge models and many loadcases the performance is slow. Does anyone have an idea how to increase the performance significantly? Is there an alternative faster call?
In interactive mode calls using the results register like res_data_load_dbresult are used and seem to be many times faster. Does anyone know a way to use the results register to extract the results and use it for individual processes?