Lenovo
Everybody knows the answer is almost always Linux, and one of the reasons for that is because Windows cheats. Mr. Exile has run a test in which he compares two laptops, one with four times the memory and about double the processor speed and a more advanced processor, with the hotter computer running XP and the older, less powered computer running Linux.
Since the valid test is not when the desktop pops up (because Windows is still busy booting when that happens), Mr. Exile instead timed how long it took for him to have a browser opened to his web based email page.
If you are a Windows…