DragonflyBSD 6.0 in VirtualBox VM.
Similar to OpenBSD, DragonflyBSD does not support VirtualBox so client does not have all the goodies provided by virtualbox client additions.
Nevertheless, it is possible (as in the case of OpenBSD) to install DragonflyBSD in full screen which makes it easier to work with.
Installer gives a choice either to to install with EFI or legacy BIOS. Both options work. I had some issues with partitioning during installation (bad superblock error), so I left default partition settings. This could be my fault though, but I did not investigate it any further.
There is a choice of HAMMER and HAMMER2 file system. I selected HAMMER2 with the partition encryption.
After OS installation, user can install packages using pkg utility.
I opted for xfce4, firefox, libreoffice, pragha, vlc, thunderbird, slim.

next I powered off VM client and run
Booted up DragonflyBSD and adjusted screen resolution using xrandr (if particular resolution is not available, xrandr helps adding custom screen resolution).
Next, I installed custom kernel, rebooted and all seems to be working.

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Nice! How is the performance compared to OpenBSD? (that's what I run).

It seems much faster

I did not run any particular tests, just standard desktop apps: firefox, libreoffice. I have to configure sound yet.

However it looks like my impressions are supported by some benchmarks tests:
https://www.phoronix.com/scan.php?pa...13-dfly6&num=1

By comparison, earlier versions of DragonFlyBSD were slower (on par with OpenBSD).
I think that it is worth try if hardware is compatible or at least in VM.

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DragonFly BSD is performance oriented, whereas OpenBSD is not. My experienced of DragonFly is that it generally outperforms OpenBSD and FreeBSD, though there will always be exceptions to the rule. That's been the case for a good few years.

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If the benchmark results are not a fluke, then this would be quite a telling: M. Dillon left FreeBSD some 20+ yrs ago because of differences in opinion about SMP (among other issues no doubt). FreeBSD went linux way (even though FBSD was technically superior to linux at the time). So if now DragonFlyBSD is taking a lead in performance, that is fantastic news. Particularly if one considers how small DragonFlyBSD team is in comparison to FreeBSD not to mention linux.

FreeBSD did not/has not gone the "Linux way". DragonFly is focused on different goals.

lockfree,lockless system servers replacing locks: yes, FreeBSD went linux way (taking similar approach).

You may need to read further on SMP and the giant lock in FreeBSD and DragonFly BSD.

NetBSD and OpenBSD still have giant locked kernels, I'm sure NetBSD were working to remove it, but not sure what progress has been made.

it seems that at least for now DragonFlyBSD has better solution that either linux or FreeBSD have.

What would I be gaining to move my 7 general purpose use laptops running FreeBSD 12.2-RELEASE-p7, using the UFS file system and generic kernel, with ports being my preferred installation method of third party programs if I moved them to DragonFlyBSD?

I am not the right person to advise about switching from one OS to another. DragonFlyBSD is designed for high scalability. It has great new fs (HAMMER2) but I would first see if whatever DragonFlyBSD does better than other OSes is what you need. Obviously I would try it on one machine.
DragonFlyBSD actually advises kernel customization and check hardware compatibility.