Laptop magazine reported in its blog on Monday that during a recent test, a when running Windows 7 instead of XP, or about 30% (6:53 for Windows 7, versus 9:24 for XP).

Web site Tom's Hardware found last month that an Acer Aspire One netbook running Windows 7's release candidate lasted 2.5 hours less than when it ran Windows XP Service Pack 3 (5:54 versus 8:28, when both were at a low-power idle state).

Complaints have also surfaced on netbook user forums such as , for Asus Eee users, , for Acer netbook users, and , for MSI fans.

The complaints follow of running Windows on MacBooks, either in virtualization or via Apple's Boot Camp software.