Thierry Feltin from our Search and Analytics development team has just posted a detailed blog on the techniques used to optimize search performance in CenterStage. Hope you'll find this useful for your own projects.
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By the way, I recommend that you subscribe to any blogs that you are interested in. Click on the Browse button at the top of the page and select Blog posts to see all the latest blogs on the site. Click the title to navigate to the blog home, then click "Receive email notifications" in the Actions menu. There are lots of interesting blogs to choose from, many of them relevant to Documentum developers. With the capability to create personal blogs recently added to ECN, you can expect to see many more as well.
Or go ahead and start your own blog!