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There is but it was disabled for the current beta weekend. I guess they didn't want evidence of the plague of framerate issues to be easily displayed in screenshots. (In before "I don't have framerate issues, the problem must not exist!!1")
If they ever re-enable it, to use it put -perf at the end of the "Target:" section of a shortcut, ie: "C:\Program Files\Guild Wars 2\Gw2.exe" -perf