eAtlasOS is considerably lighter on resources than the current Windows 8.
AtlasOS is still a 64-bit windows 10. You can't get around that. And I highly doubt you can debloat it to the point of being "lighter" than 32-bit windows 8(which is what this thing came with).
Last time windows 10 worked "fine" on 2GB RAM was back in 2015, and only on 32-bit [LTSB] distro.
Nowadays you either have to ditch AtlasOS since it does not support 32-bit and hope that your daily software won't drop 32-bit support in the next couple of years. Or go with 64-bit distro and "enjoy" comfortable experience of modern browsing on 500-700MB of available RAM(if even that), and completely forget about all benefits of Superfetch.
Another thing you seem to not understand, is the SoC in that thing. Z3745 is an
abysmal chip. Windows tablets weren't ruined by Windows 8, they did not take off solely because of hardware and Intel Atom Zxxxx was a big part of it.
Even an infamous Z8300 was nearly twice as fast, and that thing was barely capable of running my small mail server(currently using J4205 board, which has higher TDP, but a ton more performance).
P.S. And now that I dusted off my tablet, I remembered another important thing why Atlas won't work - this tab only supports 32-bit UEFI bootloader, which means Atlas is off the table. There are workarounds for linux to run 32-bit bootloader and 64-bit OS, but windows 10 is no linux.