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What was the reasoning behind using Thunar as the default file manager in Xubuntu (compared to Ubuntu's default of Nautilus). Unless I have mistakenly installed it (if so, likely as another application's dependency), Nautilus seems to be installed on Xubuntu by default, but is unused.

Is Thunar more performance friendly than Nautilus? Or is Thunar simply continuing to be used because it has been the default for Xubuntu since 6.06 release?

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I'm assuming there is some sort of discussion board or mailing list for the team in charge of releasing XUbuntu where they would have brought this up, but I cannot find it. – IQAndreas Jul 25 '14 at 18:13
2  
Thunar is the default file manager of xfce desktop as nautilus is the default of gnome, you can use any you want. – xangua Jul 25 '14 at 18:19
    
Posted an answer below, one year after this question was asked. Good reading for me at least. – clearkimura Oct 21 '15 at 18:13

This answer is based on historical sources on the Web.

The history

According to this release note, Xubuntu 6.06 had included Xfce 4.4beta1 and Thunar. This release of Xfce is also the first release to include Thunar as the default file manager, replacing the original Xfce file manager Xffm (now code named 'Rodent').

This dated project site has noted the release of Thunar as part of Xfce at that time.

16 Apr 06

The first beta release of Thunar was released today, as part of Xfce 4.4BETA1.

Regarding how Thunar becomes the default in Xfce, this can be read from the history that has been written in the Rodent user guide.

[...] To distinguish Xffm as a part of Xfce, the first release was tagged 4.0.

Then came 4.2 and the love/hate story started. Those new to Xfce could not understand why Xffm had such a steep learning curve, while those familiar to Xftree expected the nerdy behaviour they had become used to.

Anyways, it was decided that Xfce would no longer distribute a filemanager: this way users could choose the new Thunar filemanager (which, as an independent software, would no longer follow the Xfce version numbers).

The short story: It seems that the original file manager was unfriendly to new users of Xfce. You can see for yourself the file managers in Xfce 3 and Xfce 4.4 on Wikimedia Commons.

Back to questions

Unless I have mistakenly installed it (if so, likely as another application's dependency), Nautilus seems to be installed on XUbuntu by default, but is unused.

Nautilus itself is not installed by default, however nautilus-data package is installed in Xfce. It is one of the dependencies for file-roller, the Archive Manager for GNOME, which has been included in Xubuntu releases by default to this date.

Is Thunar more performance friendly than Nautilus? Or is Thunar simply continuing to be used because it has been the default for XUbuntu since 6.06?

Based on the history, we should now aware that Thunar becomes the default is mainly because of Xffm was unfriendly to new users. But there is another supporting reason: the memory usage of Thunar was significantly lower than other file managers at that time.

This legacy wiki page, which was last accessible and archived in 2012, reported the memory usage of Thunar compared to Nautilus, ROX, Konqueror and Xffm.

File manager  Virtual size  Stack size  Data size  Executable/Library size
Xffm                 16568         128       4188                    12248
Konqueror            34660         128       7884                    26644
ROX                  20980         128       5544                    15304
Nautilus             27812         128       7780                    19900
Thunar               17172         128       2900                    14140

In above table, you should look at the Data size for comparison (the reasoning for this can be read in the quoted link of legacy wiki). Note that the author had disclaimed this is "by no means 100% exact" and "just a rough measurement".

Summary

Thunar is the default file manager in Xfce, before being the default in Xubuntu. While the legacy wiki had proven that Thunar uses less memory, without testing thoroughly by ourselves, Thunar is generally more responsive than Nautilus.

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