FIM syncrhonization: slowness during export with ad management agent

Hello,

We are suffering from very bad performance when exporting updates from metaverse to AD.
The AD management agent takes among one minute per updated account(several days if we have an update on all accounts).
However the synchronization step is quite fast (among a few minutes).

In order to identify the source of the problem, we tried to made an update on all accounts with a VB.NET script.
We have executed this script localy (on the FIM synchronization service server) and it takes only several minutes.
This is why we are convinced that this issue is not relative to AD configuration.

Then, we have made several checks on the database configuration but we didn't find any problem in particulary, regarding the points below.
- table size
- cpu / memory / disk space shortage
- no dead lock
- queries execution time lower than one second

We would be grateful for any help, advice or feedback on the subject

Regards,

Serge Bouchut