Intercompany is very slow, why and how to improve?

Hi All,

I have installed intercompany 1.1 PL3 in B1882 PL12 with SQL2008R2.

there are two questions : one is performance issue while another is performance logic

Firstly, I placed an PO to vendor which is a branch (global BP) on Monday morning then I can't have SO draft being created until one day later.

Does anything got stuck? how can I tune up the process?

Secondly, after I place an PO to vendor (branch B) and SO has been created in branch B, will the corresponding SO be updated  if any change to original PO?  Will the original PO be updated if any change made in corresponding SO?

Are there any references or document I can read?

Thanks for any help.

Hellen