It seems you may have used the FemtoVG backend, which is the default if Qt is not installed and is written in pure Rust. We offer multiple rendering backends, a

It seems you may have used the FemtoVG backend, which is the default if Qt is not installed and is written in pure Rust. We offer multiple rendering backends, and you may have better results with the Qt or Skia backend, which utilize native font rendering. Additionally, a recent change made improvements to address this issue in our FemtoVG backend: https://github.com/slint-ui/slint/pull/2618 https://github.com/slint-ui/slint/pull/2618