SAFARI 5 VS OPERA 21 We compare Safari 5 to Opera 21 to find out which is the fastest browser when using Html5, Octane, Peacekeeper and Sunspider with Operating System Windows XP and AMD Athlon X2 270 CPU. The reason we are still using Windows XP because we want to show that there are still fast and secure browsers available for Windows XP even when used with limited CPU Power and Video Card Power with Windows XP."