I have WattOS R10 up and running on this spare laptop. I did all the updating I could, then had to do some manual updating to get the latest version of Firefox installed and running. So far, so good. I also installed LibreOffice and then removed Lollypop and replaced it with Rhythmbox simply because that's what I'm used to. Other apps I added include Mirage in place of gThumb and GIMP. R10 runs much faster than Mint 20.2 XFCE.
I'm most impressed with the minimal resources required for the desktop to be running. Right now, task manager is showing only 3% of the available memory is being used to load the desktop on this laptop. I have 8Gb of RAM in this laptop with approx 7GB available. Mint 20.2 XFCE is pretty consistent in using 12% to 15% to load the desktop on this laptop and also on my other three laptops. All of them have 8GB of RAM. That's a pretty healthy difference in resources used just to have the desktop up and running.
I am SO looking forward to getting my hands on R12. Hopefully I'll see very similar resource usage with R12. After playing with a LOT of different distros in the past few years I'm prepared to settle in with WattOS as my daily driver. I don't think I'll load R10 on any other laptop at this time. I think I'll wait for R12 and then install it on everything I have.
The reason I started looking around for a lightweight distro is the same as in the past. I fool around and find a distro using limited resources, get it installed and use it for a while, then notice things have slowed down. I can't understand why so many of the developers think every distro should include every bell and whistle available. Then there are the developers that believe you need fading windows, swirling cubes, elaborate sound schemes, etc, etc, in their distro. I, for one, don't need all the fancy bells and whistles. I need the OS to remain in the background while I use various apps to perform actual work.
Looking forward to R12 and if I can be of ANY assistance, please don't hesitate to call on me.