Improving Performance with Large Models in Three.js

When dealing with very large models (150k meshes) in Three.js, performance issues are common. Here are several strategies to improve your frame rate:

1. Mesh Optimization and Reduction

• Merge geometries: Combine meshes with similar materials to reduce draw calls
• Level of Detail (LOD): Implement LOD to show simpler versions of objects at a distance
• Decimation: Reduce polygon count of models that don't need high detail

2. Rendering Optimizations

• Frustum culling: Only render objects visible in the camera's view
• Occlusion culling: Skip rendering objects hidden behind others
• Use InstancedMesh: If you have many identical objects

3. Material Optimizations

• Simplify materials: Use simpler shaders and fewer texture maps
• Texture atlasing: Combine multiple textures into one larger texture
• Lower texture resolutions: Especially for distant objects

4. Scene Management

• Object pooling: Reuse objects instead of creating/destroying them
• Scene partitioning: Divide your scene into sectors and only load what's needed
• Progressive loading: Load high-detail meshes only when camera is close

5. Hardware Rendering Settings

• Adjust pixel ratio: renderer.setPixelRatio(value < 1) for lower resolution rendering
• Limit render size: Reduce the canvas size
• Enable hardware acceleration in your browser

6. Advanced Techniques

• Worker threads: Move heavy computations off the main thread
• WebGPU: Consider using WebGPU renderer if available
• Instancing and batching: Group similar draw calls together

Remember that with 150k meshes, you'll likely need to combine several of these approaches to achieve good performance.

Is there a specific aspect of your scene or rendering pipeline you'd like more detailed advice on?