Last time I checked it's using libwebkit to render html/js/css, which means, on top of my chrome typical daily browser, Tauri brings another browser(memory and CPU) into the system, which nearly doubled my 'browser resource' consumed on the computer, not good.

Tauri uses Wry[1], so it should actually be using the webview that comes with your OS. FWIW, every Electron app includes its own copy of Chromium, so that's even worse from this perspective.

[1] https://github.com/tauri-apps/wry

(edited to fix that Tauri uses Wry and not Webview)