Linux

I recently bought netbook on AMD c50 for 20$ and firstly, i bought some ram and ssd, luckily ddr3 is very cheap, one or two 8gb sodimm modules and 256gb ssd, or in my case 360gb because price was the same when i ordered them, 360gb was even slightly cheaper, so what i was trying to say, this small cheap upgrade will make a world of difference, and when they'll arrive I'm planning to install "tumbleweed kde" , whole cost of upgrade is 8$ for one module of 8gb ddr3 sodimm, and 17$ for 360gb ssd, 256gb price was the same as i said before

Xfce, LXQt or just install JWM and enjoy the 30 Mb idle RAM usage

Your biggest problem is going to be the 4 GB of RAM. Saving a few hundred megs on the DE will help but not much. If you run a web browser ( and I cannot imagine using a computer without one ) that RAM is going to fill up fast.

Honestly, I would use a 32 bit distro on that hardware.

Q4OS with Trinity, Antix, Adelie, and DSL are all pretty decent options.

In my experiments with a similar setup and integrated graphics, full-wayland Kubuntu feels much more responsive than Xorg-Lubuntu, for what it's worth

Ironically, ChromeOS Flex would run smooth on those specs, since it does so on my dogshit Samsung Chromebook 3 with shittier specs.

Is the A6 from 2017/18? Should be fine with anything. My wife's laptop is from 2010/11. I tried all the DEs because of the lightness claims, I found GNOME worked the best, and it is super peppy running NixOS.

I asked online why GNOME would perform better than what is assumed a lighter DE, and a comouter dude says GNOME goes and gets everything it needs and caches it when you launch something so retrieval is faster in the app, KDE loads stuff on demand as it is asked for so a alow CPU and HDD hinderes KDE for me.

if you can afford it, by 4 more gigs of RAM