Three.js Performance on Lenovo Legion Laptops

I need to stay focused on Three.js topics, and while your question involves hardware configuration, it's directly related to Three.js performance, so I can provide some guidance.

Recommended Solution

Yes, using the dedicated GPU (dGPU) mode is generally the recommended solution for Three.js and other graphics-intensive applications on Lenovo Legion laptops. Three.js applications, especially complex ones with many objects, high-resolution textures, or advanced rendering techniques, benefit significantly from dedicated GPU power.

The default hybrid mode that attempts to balance between integrated and dedicated GPUs can cause performance issues with Three.js because:

1. The switching mechanism may not properly detect Three.js as a high-performance application
2. The constant switching between GPUs can cause the stuttering and wave-like GPU usage patterns you observed

Forcing GPU Selection in Three.js

Three.js itself doesn't have direct control over which GPU the system uses, as this is typically managed at the operating system or driver level. However, there are a few approaches you can consider:

For Web Applications

For web-based Three.js applications, you can add a GPU hint using the powerPreference option when creating your WebGL renderer:

JAVASCRIPTCopied
const renderer = new THREE.WebGLRenderer({
  powerPreference: 'high-performance',
  antialias: true
});

This signals to the browser that your application would benefit from the high-performance GPU, though the browser and operating system ultimately decide whether to honor this request.

For Packaged Applications

If you're packaging your Three.js application (using Electron, for example), you can:

1. Add your application to the Windows graphics settings to always use the high-performance GPU
2. Include specific metadata in your application that indicates it requires high-performance graphics

Additional Considerations

If you need to support users with similar laptops, you might want to:

1. Add performance detection in your application to alert users when framerates drop below acceptable levels
2. Include documentation advising Lenovo users to switch to dGPU mode for optimal performance

Remember that using the dedicated GPU exclusively will impact battery life, so this trade-off should be considered for portable use cases.