Also worth noting is that I have obtained these results with no addons installed. I also renamed the 64-bit client to Wow.exe while testing to ensure any application profiles that rely on executable names properly detected the game.
Since my normal Krazzworks to Crushblow flight path benchmark was yielding some ugly client crashes, I decided to use Brill to the Sepulcher. The current averages are as follows:
For the 32-bit client, I'm seeing about these numbers:
Min. FPS: 15.445
Max. FPS: 582.523
Avg. FPS: 194.103
The 64-bit client is producing these framerates:
Min. FPS: 27.231
Max. FPS: 596.547
Avg. FPS: 196.362
There are some very slight theoretical gains, although unfortunately at this range it's well within a margin of error. Note that these are only early results and I will continue benchmarking. I'm going to attempt to fine-tune my settings to CPU bottleneck the game as much as possible.
The wise speak only of what they know. - J.R.R. Tolkien
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