I've only ever been intermittently impressed with KDE4 & 5. At first they seem super-fast then intermittently (whether after days, weeks, months, even after reboots) after some hours the panel stops responding for a few minutes or even up to half-an-hour then I usually reboot. After beta testing, KDE 4 & 5 were usable for many years but lately KDE5 became unusable again even after I quit indexing/searching my files... now usually is medium-to-slow speed (except on KDE Neon itself, family PC, just not on Slackware, which I may be trying to do more than KDE can handle, don't know.) MATE on the other hand, did seem fast, but I don't like its design so won't be using it. I've been using XFCE for a month, but would prefer Trinity Desktop Environment (TDE, got it to compile, but super-buggy) or more preferably somtething like Windows 3 (win3) like (Ns)CDE... seems I'd just have to wait some months/years for more features like being able to use the scroll wheel and run KDE Dolphin... there isn't much more than that I'd require, as I heard you can already run a system tray in it (like from GNOME.)

yes, it seems they are actually fixed and now the build system supports a DESTDIR variable (but I haven't tested it extensively).
I updated the build script to the latest code in git and it seems to work fine on 15.0: reading README.Slackware in the build folder is still a must, as inetd (with a couple of lines of configuration added in /etc/inetd.conf) should be enabled.
please don't report me issues or whatever because I don't feel like maintaining it neither here or on SBo so, if someone else is interested, feel free to take the script, adapt it to SBo templates for 15.0 and submit it when submissions will reopen: just leave the top five lines of the SlackBuild as they are adding your personal informations below.

https://ponce.cc/slackware/testing/CDE/

Supposed to be fixed in mate-panel-1.27.0. I am packaging it, will check.

PS. Upgraded and running. Will post again only if not solved.

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I rather like Plasma5 compared to 4 at least, but yea I would like TDE - the only other problem is TDE essentially relies on an older QT version; so then you have QT 3 , QT4 is still sticking around in Slackware15, so who knows if 15.1 will at least dump QT4 or still retain it for some reason. As for QT5 I rather dislike it, only because there is no proper utility to configure it, you have to use a third party utility - "QTCT" , and well I couldn't get it to work - not to the fault of those trying to help me, but it just doesn't work for me, so I gave up on it.

NsCDE does look interesting, for me it is a curiosity sort of thing. I never used a UNIX system in the 90s (too young), and I only saw CDE in screenshots on articles and such. I poked around with NsCDE in a VM, but wouldn't use it as a daily driver - because configuring it seems like more work and the amount of memory it uses still, I would rather just use something like Plasma5.

I assume that is a beta version right? Since AFAIK 1.26 is still stable current version. Also it is weird that the panels were crashing on me, as it wasn't doing that under a VM, but then again bare metal is always a different variable than VM.

Correction, - looks like qt4 isn't in 15 , but I probably was recalling when under current (before 15.0 released), I do recall it was still there for some reason... oh well.

All I know is hat I am using mate-panel-1.27.0 with no issue so far. This issue was reported here: https://github.com/mate-desktop/mate-panel/issues/1256 and solved by this commit: https://github.com/mate-desktop/mate...0087832e85e8c1 which is included in 1.27.0: this is why I upgraded.

Fortunately there are people willing to report issues upstream and to check the fixes before they are included in a stable release, instead of just stopping to use a software as soon as they encounter a bug.

I wonder when MSB will see this incorporated? Also I wish MSB would have that config utility that Ubuntu Mate has in re-arranging the menu to a more 9x style. Oh well right now though I am for the most part settled into Plasma5 and not really in the mood to leave, just yet.

To find out, just ask Willy... You can also just change the version and run the SlackBuild. This is what I did.
Looks to be just a "python setup.py install --root=$PKG --optimize=1" away according to this PKGBUILD (by the way I follow the blog of the maintainer (in French). Will ship that in Slint, maybe also the Brisk menu from Solus.