void siftDown(int arr[], int n, int i) {
This combination – localized Dijkstra, super-fast abstract graph traversal, and highly localized A* refinement – is what delivers the 100x speedup.
，更多细节参见爱思助手下载最新版本
const len = nums.length;
While I was writing this blog post, Vercel's Malte Ubl published their own blog post describing some research work Vercel has been doing around improving the performance of Node.js' Web streams implementation. In that post they discuss the same fundamental performance optimization problem that every implementation of Web streams face: