Цитата MSDN

Memory management enhancements include the following:
Logical prefetcher for faster boot and application launch
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Logical Prefetcher for Faster Boot and Application Launch

When a Windows XP system is booted, data is saved about all logical disk read operations. On later boots, this information is used to prefetch these files in parallel with other boot operations. During boot and application launch, a Windows system demands and pages a sizable amount of data in small chunks (4 KB to 64 KB), seeking between files, directories, and metadata. The Logical Prefetcher, which is new for Windows XP, brings much of this data into the system cache with efficient asynchronous disk I/Os that minimize seeks. During boot, the Logical Prefetcher finishes most of the disk I/Os that need to be done for starting the system in parallel to device initialization delays, providing faster boot and logon performance.

Logical prefetching is accomplished by tracing frequently accessed pages in supported scenarios and efficiently bringing them into memory when the scenario is launched again. When a supported scenario is started, the transition page faults from mapped files are traced, recording which page of a file is accessed. When the scenario has completed (either the machine has booted or the application started), the trace is picked up by a user-mode maintenance service, the Task Scheduler. The information in the trace is used to update or create a prefetch-instructions file that specifies which pages from which files should be prefetched at the next launch.

The user-mode service determines which pages to prefetch by looking at how successful prefetching has been for that scenario in the past, and which pages were accessed in the last several launches of the scenario. When the scenario is run again, the kernel opens the prefetch instructions file and asynchronously queues paging I/O for all of the frequently accessed pages. The actual disk I/Os are sorted by the disk drivers to go up the disk once to load all pages that are not already in memory. This minimizes seeks, cuts down on disk time, and increases performance. The kernel also prefetches the file system metadata for the scenario, for example, MFT entries and directory files. Because prefetching is useful only when the required data is not in memory, the applications that are launched frequently are not traced and prefetched each time.
Settings for Logical Prefetch

Registry setting:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session
Manager\Memory Management\PrefetchParameters
RootDirPath - Key Name
Reg_SZ _ Data Type
Prefetch - Value <default>

Value Names:

EnablePrefetcher (DWORD)
0x00000001= application launch prefetching
0x00000002= boot prefetching

Parameters are ANDed, so if all were enabled, the setting would be 0x00000003. The setting takes effect immediately. In Windows XP Server editions and later versions, only the boot prefetch is enabled by default. Application prefetch can be enabled by the registry setting cited here. The system boot prefetch file is in the %systemroot%\Prefetch directory. Although these prefetch-readable files can be opened using Notepad, they contain binary data that will not be recognized by Notepad. If you are going to view these file, make them read only or copy them to a different location before opening.

Цитата Real nowhereman

Цитата статья

На компьютерах с кол-ом памяти <=128Mb функция Prefetch может вызвать замедление работы системы из-за большого потребления оперативной памяти

Цитата Redew

папка Автозагрузка »

Цитата Redew

Использовать "щадящий ресурсы" антивирус и фаервол - хотя лучше пусть чуть тормозит, чем пропускает гадость. »

Цитата silalex

при переустановке ОС Windows XP поверх существующей (выбор в текстовой стадии опции восстановления) приводит ли изменённые установки реестра к первоначальным? »

Цитата ShaddyR

зависит от того, какие именно ключи реестра были изменены. »

Цитата silalex

все ли системные файлы заменяются на исходные (с дистрибутива)? »