Performance CRM_MKTBP_CHANGE_BP

We are trying to upload marketing attributes for around 9000 business partners using the function module CRM_MKTBP_CHANGE_BP. Every BP has around 4 types of marketing attributes sets. Every sets needs a call of the FM. This in total means: 9000x4 calls and each call takes around 1 second.

Is there any way to speed up the processing time of this module or is there a function module that can handle multiple sets/BPs at once?

We are using CRM 5.0.

Thanks in advance.