chore: perf diff against latest release

benchmark/diff.js

@@ -0,0 +1,47 @@
+#!/usr/bin/env node
+const { performance } = require('perf_hooks')
+const path = require('path')
+
+const FILE_LOCAL = process.argv[2]
+const FILE_LATEST = process.argv[3]
+console.log(`Local:  ${FILE_LOCAL}`)
+console.log(`Latest: ${FILE_LATEST}`)
+
+const { createEngine } = require('./engines/create-liquid')
+const local = createEngine(require(path.resolve(__dirname, '..', FILE_LOCAL)))
+const latest = createEngine(require(path.resolve(__dirname, '..', FILE_LOCAL)))
+const data = require('./data/todolist.json')
+const tpl = path.resolve(__dirname, `templates/todolist`)
+
+const begin = performance.now()
+const tplLocal = local.load(tpl)
+const tplLatest = latest.load(tpl)
+const tasks = [
+  {
+    cycles: 0,
+    time: 0,
+    fn: () => latest.render(tplLatest, data)
+  },
+  {
+    cycles: 0,
+    time: 0,
+    fn: () => local.render(tplLocal, data)
+  }
+]
+while (performance.now() - begin < 20e3) {
+  const task = tasks[Math.floor(Math.random() * 2)]
+  task.time -= performance.now()
+  task.fn()
+  task.time += performance.now()
+  task.cycles++
+}
+
+const [ latestResult, localResult ] = tasks.map(task => {
+  task.perf = task.cycles * 1000 / task.time
+  return task
+})
+const diff = (localResult.perf - latestResult.perf) / latestResult.perf
+
+console.log(`Local: ${localResult.perf.toFixed(3)} ops/s (${localResult.cycles} cycles)`)
+console.log(`Latest: ${latestResult.perf.toFixed(3)} ops/s (${latestResult.cycles} cycles)`)
+console.log(`Diff: ${(diff * 100).toFixed(3)}%`)