不是说 Node 12 又快很多了吗，这是错觉？

测试代码

const http = require("http");
const fs = require("fs");
const path = require("path");

const port = 3000;

function sleep(ms) {
  return new Promise(resolve => {
    setTimeout(() => {
      resolve();
    }, ms);
  });
}

http
  .createServer(async function(request, response) {
    await sleep(200);
    response.end("Hello, world!");
  })
  .listen(port);

console.log(`listen http://localhost:${port}/`);

Node v10.15.3

> siege -c 100 -t 10s http://127.0.0.1:3000/
Transactions:		        4193 hits
Availability:		      100.00 %
Elapsed time:		        9.83 secs
Data transferred:	        0.05 MB
Response time:		        0.23 secs
Transaction rate:	      426.55 trans/sec
Throughput:		        0.01 MB/sec
Concurrency:		       98.04
Successful transactions:        4200
Failed transactions:	           0
Longest transaction:	        0.26
Shortest transaction:	        0.20

Node v12.0.0

> siege -c 100 -t 10s http://127.0.0.1:3000/
Transactions:		        3809 hits
Availability:		      100.00 %
Elapsed time:		        9.10 secs
Data transferred:	        0.05 MB
Response time:		        0.23 secs
Transaction rate:	      418.57 trans/sec
Throughput:		        0.01 MB/sec
Concurrency:		       96.55
Successful transactions:        3809
Failed transactions:	           0
Longest transaction:	        0.26
Shortest transaction:	        0.20