node_readlines.mjs

import fs from "node:fs"
import readline from "node:readline"

const t0 = performance.now()
const stream = fs.createReadStream("input.txt")
const rl = readline.createInterface({
  input: stream,
  crlfDelay: Infinity
})

let out = []

for await (const line of rl) {
  const [a, b, c] = line.split(',').map(Number)
  const n = 4 * a + b * b + (c / 3)
  if (out.length && out[out.length - 1] > n) {
    out.push(n - out[out.length - 1])
  }
  out.push(n)
}

const d = (performance.now() - t0) / 1e3
console.log("computed", out.length, "in", d, "seconds")
console.log(out.length / d, "lines/sec")