To be honest, the only framework I have profound experience with is GTK with the help of relm (not relm4 yet, wasn't available back then, that would be my go-to crate nowadays for these use cases), and I can't judge memory/cpu requirements there. I'd probably take a closer look at #relm4, #iced or #tauri if I'd have to develop something with GUI, depending on the requirements.

For people interested in #rust I can recommend the https://rustacean-station.org/ podcast. Just listened to the episode about #Tauri with Daniel Thompson-Yvetot from July. I really like their attitude toward security and community. Also I discovered Tauri looks more interesting than I initially thought, so it might be worth a look. According to them, #Servo might be resurrected to some degree in the context of Tauri development because of the complications when using different webviews on each system.