three.js 性能优化

Reference

1. https://discoverthreejs.com/tips-and-tricks/
2. https://blog.mozvr.com/a-painter-performance-optimizations/
3. https://stackoverflow.com/questions/57517213/javascript-threejs-and-gc
4. https://stackoverflow.com/questions/25690039/three-js-performance
5. https://docs.unity3d.com/Manual/OptimizingGraphicsPerformance.html
6. https://docs.unrealengine.com/en-US/Engine/Performance/Guidelines/index.html