I posted the following results in the comments:
MacBook Pro 2.16 GHz Core Duo Mac OS X 10.4.8 Flash 9.0.28 (Intel native) Safari 2.0.4: DHTML: 141 FPS (not a typo) Flex: 50 FPS Flex (caching): 58 FPS WPF/E: 100 FPS WPF: NA Firefox 2.0.2: DHTML: 72 FPS Flex: 31 FPS Flex (caching): 42 FPS WPF/E: 64 FPS WPF: NA Windows Server 2003 R2 SP1 (running in Parallels 3186) NOTE: There seems to be more variability in the scores, with some ramp-up time IE7: DHTML: 80 FPS Flex: 70 FPS Flex (caching): 96 FPS WPF/E: 81 FPS WPF: 97 FPS Firefox 2.0.2: DHTML: 53 FPS Flex: 56 FPS Flex (caching): 64 FPS WPF/E: 58 FPS WPF: NAI should really boot into Windows to complete the test run, but to lazy right now.