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Is there any way to improve performance of 7-Zip extract？ #512

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opened 2026-01-29 22:13:07 +00:00 by claunia · 5 comments
claunia commented 2026-01-29 22:13:07 +00:00
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Originally created by @v2codes on GitHub (Mar 31, 2022).

Hello,
I have a performance problem described below, how can I solve this?
If the 7z file without password, decompress it expend less then 1 seconds.
But when set a password, it takes more then 50 seconds.

7z file info:
Size: 6MB
File Count: 67

Sample Code :
`

        using (var archive = SevenZipArchive.Open(ppFile, new SharpCompress.Readers.ReaderOptions() { Password = key1 }))
        // using (var archive = SevenZipArchive.Open(ppFile))
        {
            archive.WriteToDirectory(ppFilePath, new ExtractionOptions()
            {
                ExtractFullPath = true,
                Overwrite = true,
                PreserveFileTime = false,
                PreserveAttributes = false
            });
        }

`

Thanks for help.

Originally created by @v2codes on GitHub (Mar 31, 2022). Hello, I have a performance problem described below, how can I solve this? If the 7z file without password, decompress it expend less then 1 seconds. But when set a password, it takes more then 50 seconds. 7z file info: Size: 6MB File Count: 67 Sample Code : ` using (var archive = SevenZipArchive.Open(ppFile, new SharpCompress.Readers.ReaderOptions() { Password = key1 })) // using (var archive = SevenZipArchive.Open(ppFile)) { archive.WriteToDirectory(ppFilePath, new ExtractionOptions() { ExtractFullPath = true, Overwrite = true, PreserveFileTime = false, PreserveAttributes = false }); } ` Thanks for help.
claunia added the bugup for grabs labels 2026-01-29 22:13:07 +00:00
claunia commented 2026-01-29 22:13:07 +00:00
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@adamhathcock commented on GitHub (Mar 31, 2022):

Sounds like someone should take some debugging to this because you're right.

@adamhathcock commented on GitHub (Mar 31, 2022): Sounds like someone should take some debugging to this because you're right.
claunia commented 2026-01-29 22:13:07 +00:00
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@ericsia commented on GitHub (Nov 3, 2022):

Sorry for asking, is it necessary for second parameter to be self initialise?
Because the ReaderOption options when null will initialise leaveStreamOpen as false right?

@ericsia commented on GitHub (Nov 3, 2022): Sorry for asking, is it necessary for second parameter to be self initialise? Because the `ReaderOption options` when null will initialise leaveStreamOpen as false right?
claunia commented 2026-01-29 22:13:07 +00:00
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@adamhathcock commented on GitHub (Nov 3, 2022):

Looking at the code, it won't because it if no options are supplied then one is made internally and the default option is true.

@adamhathcock commented on GitHub (Nov 3, 2022): Looking at the code, it won't because it if no options are supplied then one is made internally and the default option is true.
claunia commented 2026-01-29 22:13:08 +00:00
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@ericsia commented on GitHub (Nov 3, 2022):

Looking at the code, it won't because it if no options are supplied then one is made internally and the default option is true.

I have one last question. For this project do it support .net framework 3.5? Or it need framework 6 to work?
I wish to test lzma2 for unzip only

@ericsia commented on GitHub (Nov 3, 2022): > Looking at the code, it won't because it if no options are supplied then one is made internally and the default option is true. I have one last question. For this project do it support .net framework 3.5? Or it need framework 6 to work? I wish to test lzma2 for unzip only
claunia commented 2026-01-29 22:13:08 +00:00
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@adamhathcock commented on GitHub (Nov 3, 2022):

this is out of scope of this issue but the csproj and nuget list what targets are supported and legacy .NET Framework 3.5 isn't one of them.

@adamhathcock commented on GitHub (Nov 3, 2022): this is out of scope of this issue but the csproj and nuget list what targets are supported and legacy .NET Framework 3.5 isn't one of them.
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Reference: starred/sharpcompress#512
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