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Defect #239

Updated by Greg Burri about 7 years ago

On Windows the download rate may rise then suddenly fall. It may be related to the system cache which can be deactivated in the hard drive properties page. 

 * Try to check is some more options can be used when a file is opened or written : https://github.com/Ummon/D-LAN/blob/master/application/Core/FileManager/priv/Cache/File.cpp#L278 
 ** There is some interesting options here (like FILE_FLAG_NO_BUFFERING): http://msdn.microsoft.com/en-us/library/windows/desktop/aa363858%28v=vs.85%29.aspx 
 * Look if the Qt layer is optimal and can be replaced by ours.

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