While testing versions of the cognite-sdk python >= 7.37.0, we noticed a performance issue in the "retrieve_dataframe" method of the time series API for all versions 7.37.x ( x >= 0 and x <= 3).
Example: For the same data window, we tested with version 7.0.0 and the latest versions. The processing time for version 7.0.0 in this method was less than 5 seconds, while for newer versions the processing time was 3 minutes.