Second Life 3.2.5 (246213) Dec 6 2011 01:14:40 (Second Life Developer)
CPU: AMD Phenom II X4 965 Processor (3411.31 MHz)
Memory: 7965 MB
OS Version: Linux 3.0.0-14-generic #23-Ubuntu SMP Mon Nov 21 20:28:43 UTC 2011 x86_64
Graphics Card Vendor: NVIDIA Corporation
Graphics Card: GeForce GTX 560 Ti/PCI/SSE2
OpenGL Version: 4.2.0 NVIDIA 290.10
Simple areas such as just a few buildings around, I get 70 FPS with 'Lights and Shadows' on, ambient occlusion off, shadows off, depth of field off and a DD of 128. Everything else is on and at full with the exception of non-imposters which is set to 12 (default). These are also my most common settings as it provides a very good balance between performance and graphics quality.
Shadows and ambient occlusion on in the same scene, 48 FPS.
In more demanding scenes such as a few avatars being around or a more-built up area, usually between 35 and 50 with the same settings I got 70 FPS before.
In demanding scenes I can't enable shadows due to a bug that occurs in any viewer that has Runitai's changes. (https://jira.secondlife.com/browse/SH-2652)
In very demanding scenes, such as 30+ avatars in view, usually around 20-30 FPS with again, same settings without shadows being on.
Right now, shining-fixes is the only viewer that is this fast on my system. All others are slower.