Why do windows open files so slowly for the first time and there is a faster way

This is Windows 7, 64 bit, Professional using

Consider a very simple loop

for (i = 0; i < names->size(); i++)
{
    std::string Name = names->at(i);
    HANDLE fileHandle = CreateFile(Name.c_str(), GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, 0, NULL);

    if (fileHandle == INVALID_HANDLE_VALUE)
    {
        throw "Failed";
    }

    CloseHandle(fileHandle);
}

If I run this in a directory with 863 files, it takes just over 22 seconds or 25 milliseconds / file. Next time, 169 milliseconds or 0.19 milliseconds / file. If I just use find_file time in the new directory, it is very fast, about 0.2 ms / file. Although I used CreateFile here, other methods give the same results.

Of course, the answer is file caching: windows should cache file opening information. Moreover, it should be access to the disk, as if the directory was on the SSD, the first and second open approximately the same.

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