If it is Electron, I don't think you can credibly call an entire Chromium instance a "very slim wrapper".
https://dteare.medium.com/behind-the-scenes-of-1password-for...
% tar ztf 1password-latest.tar.gz | grep "chrome"
1password-8.1.1.x64/chrome-sandbox
1password-8.1.1.x64/chrome_100_percent.pak
1password-8.1.1.x64/chrome_200_percent.pakEDIT: 168MiB resident memory on my system (just checked).
Though it malloc'd (but never used) 32G, that's worrying.