Not all the time Multipartition Tablespace better performance

Hi All,
I have a shell script where a lot of batch job processing involve, such load into a temporary table, comparison and update and so forth.
Once of the temporary table initially I created using single partition tablespace but due to timing I want to test to put this temp table into multipartition to gain performance. But, I can't imagine with multipartition table loading and reading... it cause 8 hours whereas I recreated the table into single partition tablespace, it only took only 30min to complete. Is this contention happen in multi-partition tablespace? What are the condition does not recommend to use multi-partition tablespace?

Thanks.