In early October VMware released Site Recovery Manager 4.0 (it should be 2.0 actually, but the marketing aligned the numbering to vSphere 4.0).
On this new product the company recently published a 20-pages performance study called VMware vCenter Site Recovery Manager 4.0 Performance and Best Practices for Performance.
The paper details how the recovery time is impacted by different storage backend technologies, network latency, amount of protected VMs, recovery plan configuration and more.