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Dear Experts, I am trying to run a MELODIC analysis on an fMRI dataset with 4000 volumes (รก 5 slices, 32bit float). A test run with a dataset containing 1000 vols was completed within some 15 minutes on my MacBook. The processing of the 4000 vols dataset, however, does not seem to finish in a reasonable time. Can anyone tell about complexity of the ICA algorithm? Is it linear, qudaratic, etc.? Or is it impossible to tell, since runtime depends on the actual data? Anyway, processing is still running and is taking far more time than expected from the test run. I am thankful for any comments to exclude that the processing is stuck... Thanks, Daniel