Is there a particular application that creates persistence or save files in Puppy or antiX? I would like to put it on Devuan. I have the ascii ISO and can have a persistence partition created with Rufus but it's slow on older computers. Like when you dist-upgrade, that is, it becomes terribly slow for a while.

Looks like there are lots of posts for that.

https://www.google.com/search?q=site...%20persistance

https://www.google.com/search?source...=Google+Search

Loading to RAM achieves my goal. It's fast and changes are saved after you finish as long as you have a persistence partition. It's not as convenient as Puppy's style where you can resize the pupsave file on demand (as opposed to resizing partitions), but this addresses my need for speed.

And how exactly did you achieve that?
Please share your solution, in detail.
These (and most) forums are not a hit-and-run thing, people come here to find solutions as much as they ask questions.

I haven't tried puppy nor Antix yet but i did get linuxmint-19.3-cinnamon-64bit.iso
As a live OS working with persistence.I simply used ventoy which uses a 1 gig .img fiel for persistence.
Ventoy formats a usb into 2 partitions:

Device Boot Start End Sectors Size Id Type
/dev/sdc1 * 2048 7800831 7798784 3.7G 7 HPFS/NTFS/exFAT
/dev/sdc2 7800832 7866367 65536 32M ef EFI (FAT-12/16/32)
bash-5.0#


On the 1st partition, you can just drag and drop "intact" os iso's ; you can have a few iso's and choose which one to boot

basic structure of what goes where :

bash-5.0$ cd /run/media/andrew
bash-5.0$ ls --color
ventoy
bash-5.0$ tree -L 2 ventoy
ventoy
├── ISO
│** └── linuxmint-19.3-cinnamon-64bit.iso
├── persistence.img
└── ventoy
└── ventoy.json

2 directories, 3 files
bash-5.0$

see : https://ventoy.net/en/index.html


https://github.com/ventoy/Ventoy/releases/








https://ventoy.net/en/index.html

You can. antiX uses a persistence file (actually you can have 2 if you wish - rootfs and homefs). Both can be resized in the live section of the control centre.