I tested out a handful of systems. Results below:
64-bit Windows 7, Intel Core i7 3610QM @ 2.3GHz, Intel HD Graphics 4000
1.6.1 1.7.0-beta QuickNES
NES:
Akumajou Densetsu (Castlevania 3JP) 131fps 122fps 938fps
Super Mario Bros. 146fps 141fps 942fps
Mega Man 6 126fps 123fps 925fps
SNES:
Super Mario All-Stars 106fps 97fps
(performance core) 144fps 138fps
Earthbound 109fps 102fps
(performance core) 156fps 135fps
Mega Man X2 90fps 86fps
A2600:
Kangaroo 176fps 165fps
Dodge 'em 183fps 172fps
Dethstar 172fps 166fps
DMG:
Rockman World 1996fps 1512fps
Minesweeper 2039fps 1521fps
X 1641fps 1233fps
GBC:
E Mo Dao 1560fps 1293fps
Mega Man Xtreme 2 1698fps 1338fps
Project S-11 1932fps 1491fps
SGB:
Pokémon Red 53fps 51fps
EDIT: Whoops, turned out I had rewind on on the 1.7.0 beta. Will retime later. EDIT2: Timings fixed.
(Also, a note from adelikat that people should make sure to turn off rewind for testing)