120+ performance rules across 18 categories for optimizing Three.js applications.

• Organized by priority from fundamental setup (Import Maps, modern renderers) through critical concerns (memory disposal, render loops, draw calls) to specialized topics (WebGPU, TSL shaders, WebXR)
• Covers both WebGLRenderer and WebGPURenderer with guidance on choosing between them and leveraging TSL (Three.js Shading Language) for shader development
• Includes practical rules for geometry batching, material reuse, texture compression (Draco, KTX2), lighting optimization, and mobile-specific constraints like pixel ratio limits and shader precision
• Each rule references detailed documentation with BAD/GOOD code examples, targeting performance goals like sub-100 draw calls per frame and proper resource cleanup to prevent memory leaks