Caja crashes when trying to view a parent directory

[Robert Pearson]

Using VisualWorks to check some of my data files. With over 4 million files, manual checking is unreliable and slow. When VisualWorks finds an error I try to use Caja to view the directory and its contents. I clicked the parent directory I wanted (../../../) and waited, and waited, and waited. After 8 minutes I decided that Caja had crashed since every Caja window is frozen. I searched the web for how to kill an app. The Force Quit Button looks very neat, but installing one does not work in MATE. I finally found Alt F2 and xkill which works works.

The only background activity was a Terminal command:
cp -anR "/media/robert/4TB Seagate 3/Users" "/media/robert/6TB Seagate 1"
which has been running for 3 days and I assume crashed because I see no new directories showing up on the target volume.

Apparently Ubuntu MATE 18.04 has a design flaw. It does not handle large external drives well and is slow as continental drift with a 6TB drive mounted. Trying to copy 1 TB onto a 6TB drive takes over 6 days. Copying 3 TB from a 4TB to a 4TB takes only two days. This is an obvious design scale defect. (An algorithm which works with a small set of data may not work acceptably with a large set of data.)

Please have the developers examine their design and find out where the flaw is. Have them plug in a 12 TB external USB 3 drive (the largest commonly available size for desktop computers ) and see incredible slowdown. (Using Caja to view a directory may take over 3 minutes to show 247 files.)

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: caja 1.20.2-4ubuntu1
ProcVersionSignature: Ubuntu 4.15.0-38.41-generic 4.15.18
Uname: Linux 4.15.0-38-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.4
Architecture: amd64
CurrentDesktop: MATE
Date: Thu Nov 15 02:57:24 2018
ExecutablePath: /usr/bin/caja
InstallationDate: Installed on 2018-10-25 (21 days ago)
InstallationMedia: Ubuntu-MATE 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
ProcEnviron:
 LANGUAGE=en_US
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: caja
UpgradeStatus: No upgrade log present (probably fresh install)

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[Expired for Ubuntu MATE because there has been no activity for 60 days.]

[Launchpad Janitor (janitor)]

[Expired for caja (Ubuntu) because there has been no activity for 60 days.]