The Forefront Identity Manager team has released a new rollup hotfix package (build 4.0.3573.2). The Knowledge Base article (http://support.microsoft.com/kb/2417774) describes the changes so I’m not going to go through the updates here but one is worth highlighting; this package includes improvements to initial load performance in the FIM MA. This improvements adds new configuration settings for the FIM MA which you can read about in the above KB article.
What other updates have been released since FIM 2010 was released? This latest hotfix rollup package includes all previously released hotfixes but the KB only talks about the new fixes. If you follow the links to previous articles you can gather a complete list of hotfixes included