Delivered with Snap12.
Verified Fixed in SNAP14. Using the exact same scenario with SNAP14, average registration response timing did not increase through out the 10,000 registrations. Relative Performance improvement of 33% at 0-1000 registrations that rises up to 78% at 9000-10000 registrations.
Created attachment 1056822 [details] Top Graph is SNAP9-Compose3 showing issue, Bottom Graph shows SNAP14 without issue.
This bug was fixed in Satellite 6.1.1 which was delivered on 12 August, 2015.