Ask HN: Best Language & Framework for GUI development

Hello, I am looking to make a GUI application for desktop, I want it to be lightweight as it will be running during resource intensive tasks like video rendering etc

These are my requirements - Lightweight, shouldn't be resource heavy: below (75 MB Ram) and low CPU & GPU preferably

- Language shouldn't have a massive learning curve/ super esoteric

- A GUI Desktop app

- Possible to make minimalistic but nice looking UI

- Frontend and backend same language

- Supports cross-platform (Optional)

Thank you for reading my post :)