As a technically interested person and die-hard Windows XP Professional 32-bit enthusiast , I installed Thorium on my very old and very weak computer for testing purposes only.
My hardware and OS specs are: Windows XP Professional SP3 with all updates after SP3 and additionally all POSReady updates, an Intel Pentium 4 Northwood 2.80 GHz CPU (single core, 32 Bit), 1.5 GB SD-RAM and a NVIDIA GeForce 6200 graphic card.
I am using the version Thorium_SSE2_122.0.6261.168_WINXP_x32 in portable mode. Nothing has been installed to avoid any compromising of my system. It was hard to adjust the browser settings and flags to load pages as it actually should be. I am using the extension uBlock Origin as I do in all my browsers to filter and block all crap. However, uBlock Origin had to be exactly adjusted to not interfere negatively the loading of websites. I will test Thorium for a while to see how it behaves on my very weak Windows XP computer. But in any case, I am also interested in experiences from other users with Thorium on old 32-bit computers.