In game development, SIMD is often seen as the holy grail of CPU performance but is difficult to achieve real gains from. While it feels good to implement, it may not always provide proven benefits and can sometimes hinder progress. However, by utilizing graph coloring, multiple contact constraints can be solved simultaneously without race conditions. This method, although complex and potentially slow, can significantly improve game physics processing speed. Using SIMD processing in game physics requires a lot of setup work, but when benchmarked, results showed a significant increase in performance, especially with AVX2 instruction sets. Ultimately, the effort put into utilizing SIMD can greatly enhance game performance and handle more complex scenarios efficiently.
https://box2d.org/posts/2024/08/simd-matters/