Tauri:

   Test CPU RAM GPU
   Idle 1% ~ 80MB 0%

For the comparison, Sciter:

   Idle 0.01% ~ 40MB 0%

With startup time (minimal hello world) 200ms

As of memory consumption: the bulk amount is in graphics backend - Direct2D in case of Sciter. I believe the same cap applies to Tauri and Electron.