Python node takes ages to transfer from pd dataframe to output table

I assembled an pandas dataframe of about 200k rows and 10 columns via rest api, which takes about 1 minute.

If I then want to convert it to the knime output table by doing knio.outputtables[0] = knio.Table.frompandas(final_table), that takes forever (I quit after 30 minutes, this only takes seconds when doing it outside of knime).

Is this normal? Python nodes seem useless when working with larger datasets in this case.