Qorus Software has on offer, a Merge Server which Enterprise or Ultimate customers have a choice of using. The merge server is setup on a stand-alone server which is linked directly to the SharePoint server via central admin. It offloads the processing of merging to the Merge Server so the SharePoint server does not become over encumbered and in-turn degrade the SharePoint user's experience.
For more information on the Merge process, click here
For more information on Merge Server performance, click here
For more information on the Merge Server's requirements and installation, click here
For more information on troubleshooting the Merge Server, click here