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If you tell me what you are using, I can tell you the best backend to select for performance.

Ensure you are not using Dolphin 5.0 stable. Update to the latest development build. Game Stutters or Lags

Go to Graphics > General and check Aspect Ratio: 16:9 alongside the Widescreen Hack option under enhancements. While it can cause minor visual stretching on the very edges of cutscenes, it makes the gameplay look vastly more modern.

Stick to 4:3 . Enabling widescreen can sometimes cause compression issues that make character portraits look pixelated.

Menus, combat text, and character portraits are perfectly sharp.

The single biggest visual complaint from players running Radiant Dawn on modern screens is that character portraits look muddy.

Do you need troubleshooting steps for or lag ?