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https://issues.apache.org/jira/browse/NET-519?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13829756#comment-13829756
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Thomas Neidhart commented on NET-519:
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This is most likely related to this issue.
There reports on the user ml that there is still a slowdown in 3.3 compared to
the 3.1 version.
> Apache Commons Net 3.3 has a performance issue
> ----------------------------------------------
>
> Key: NET-519
> URL: https://issues.apache.org/jira/browse/NET-519
> Project: Commons Net
> Issue Type: Bug
> Components: FTP
> Affects Versions: 3.2, 3.3
> Environment: Windows 7
> Reporter: Bambi Edgar Mota
> Fix For: 3.4
>
>
> We use Apache Commons Net FTP 3.1. That version had a bug for transferring
> files with size 0 that was resolved in Apache Commons 3.2.
> Apache Commons 3.2 and 3.3 however both have a performance problem for files
> that do not have a size of 0.
> For example a 30MB file using 3.1 takes approximately 40 seconds on our
> system from point A to point B.
> Using Apache 3.3, the same file takes 2 minutes and 5 seconds.
> Using Apache 3.2, the same file took over 4 minutes.
> This is not acceptable.
> If there are any workarounds, we would like to know. If not this is a major
> bug.
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