Some of the biggest criticisms of Vista relate to performance, and Microsoft appears to have made addressing them a priority. Boot time for a Microsoft-furnished lapŽtop with the pre-beta code seemed fast. Of course, we won't be able to make a fair comparison until we can test identical machines with the same installations of Vista and Windows 7, but Microsoft is taking steps to speed things up. First, Windows 7 initializes many services in parallel; and second, it has fewer services to initialize.
Another area Microsoft says it is working on is the way the OS allocates memory to new windows. In Vista, the amount of memory allocated per window goes up as you add windows, to the point where the system sometimes shuts dovm Aero for lack of available memory. In Windows 7, each new window will be allocated the same amount of memory, so adding new windows won't strain system resources as quickly.

Other changes are designed to make the as less crash-prone. Faulttolerant "heaps," for example, are intended to address memory management headaches without crashing problem apps; at the same time, process reflection should reduce crashes by allowing Windows to diagnose and (maybe) repair process issues without crashing the application involved. Microsoft also says that its new OS will "sandbox" printer drivers so that glitches stemming from poorly written drivers won't create difficulties either for other drivers or for the system as a whole

Microsoft is also working on ways to prolong notebook battery life by reducing poWer consumption. Examples of such tricks would include enabling laptops to cut back on background activisame ties, to intelligently dim displays (with technologies similar to those used with cell phone displays), and to play back DVDs more efficiently