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diff --git a/intl/benchmarks/perftest_numberFormat.js b/intl/benchmarks/perftest_numberFormat.js
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+++ b/intl/benchmarks/perftest_numberFormat.js
@@ -0,0 +1,221 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+// @ts-check
+
+var perfMetadata = {
+  owner: "Internationalization Team",
+  name: "Intl.NumberFormat",
+  description: "Test the speed of the Intl.NumberFormat implementation.",
+  options: {
+    default: {
+      perfherder: true,
+      perfherder_metrics: [
+        {
+          name: "Intl.NumberFormat constructor iterations",
+          unit: "iterations",
+        },
+        { name: "Intl.NumberFormat constructor accumulatedTime", unit: "ms" },
+        { name: "Intl.NumberFormat constructor perCallTime", unit: "ms" },
+
+        {
+          name: "Intl.NumberFormat.prototype.format iterations",
+          unit: "iterations",
+        },
+        {
+          name: "Intl.NumberFormat.prototype.format accumulatedTime",
+          unit: "ms",
+        },
+        {
+          name: "Intl.NumberFormat.prototype.format perCallTime",
+          unit: "ms",
+        },
+
+        {
+          name: "Intl.NumberFormat.prototype.formatToParts iterations",
+          unit: "iterations",
+        },
+        {
+          name: "Intl.NumberFormat.prototype.formatToParts accumulatedTime",
+          unit: "ms",
+        },
+        {
+          name: "Intl.NumberFormat.prototype.formatToParts perCallTime",
+          unit: "ms",
+        },
+      ],
+      verbose: true,
+    },
+  },
+  tags: ["intl", "ecma402"],
+};
+
+add_task(function measure_numberformat() {
+  const measureConstructor = measureIterations("Intl.NumberFormat constructor");
+  const measureFormat = measureIterations("Intl.NumberFormat.prototype.format");
+  const measureFormatToParts = measureIterations(
+    "Intl.NumberFormat.prototype.formatToParts"
+  );
+
+  // Re-use the config between runs.
+
+  const styles = ["decimal", "percent", "currency", "unit"];
+
+  const numberStyles = [
+    "arab",
+    "arabext",
+    "bali",
+    "beng",
+    "deva",
+    "fullwide",
+    "gujr",
+    "guru",
+    "hanidec",
+    "khmr",
+    "knda",
+    "laoo",
+    "latn",
+    "limb",
+    "mlym",
+    "mong",
+    "mymr",
+    "orya",
+    "tamldec",
+    "telu",
+    "thai",
+    "tibt",
+  ];
+
+  const decimalOptions = {
+    notation: ["scientific", "engineering", "compact"],
+    useGroup: [true, false],
+  };
+
+  const currencyOptions = {
+    currency: ["USD", "CAD", "EUR", "Yen", "MXN", "SAR", "INR", "CNY", "IDR"],
+    currencyDisplay: ["symbol", "narrowSymbol", "code", "name"],
+    currencySign: ["accounting", "standard"],
+  };
+
+  const unitOptions = {
+    unit: [
+      "acre",
+      "bit",
+      "byte",
+      "celsius",
+      "centimeter",
+      "day",
+      "degree",
+      "fahrenheit",
+      "fluid-ounce",
+      "foot",
+      "gallon",
+      "gigabit",
+      "gigabyte",
+      "gram",
+      "hectare",
+      "hour",
+      "inch",
+      "kilobit",
+      "kilobyte",
+      "kilogram",
+      "kilometer",
+      "liter",
+      "megabit",
+      "megabyte",
+      "meter",
+      "mile",
+      "mile-scandinavian",
+      "milliliter",
+      "millimeter",
+      "millisecond",
+      "minute",
+      "month",
+      "ounce",
+      "percent",
+      "petabyte",
+      "pound",
+      "second",
+      "stone",
+      "terabit",
+      "terabyte",
+      "week",
+      "yard",
+      "year",
+      "meter-per-second",
+      "kilometer-per-hour",
+    ],
+    unitDisplay: ["long", "short", "narrow"],
+  };
+
+  function choose(options) {
+    return options[Math.floor(options.length * prng())];
+  }
+
+  function randomizeConfig(config, options) {
+    for (let option in options) {
+      config[option] = choose(options[option]);
+    }
+  }
+
+  // Split each step of the benchmark into separate JS functions so that performance
+  // profiles are easy to analyze.
+
+  function benchmarkNumberFormatConstructor() {
+    for (let i = 0; i < 1000; i++) {
+      // Create a random configuration powered by a pseudo-random number generator. This
+      // way the configurations will be the same between 2 different runs.
+      const locale = pickRepresentativeLocale();
+      const style = choose(styles);
+      const nu = choose(numberStyles);
+      let config = {
+        style,
+        nu,
+      };
+      if (style == "decimal") {
+        randomizeConfig(config, decimalOptions);
+      } else if (style == "currency") {
+        randomizeConfig(config, currencyOptions);
+      } else if (style == "unit") {
+        randomizeConfig(config, unitOptions);
+      }
+
+      // Measure the constructor.
+      measureConstructor.start();
+      const formatter = Intl.NumberFormat(locale, config);
+      // Also include one format operation to ensure the constructor is de-lazified.
+      formatter.format(0);
+      measureConstructor.stop();
+
+      benchmarkFormatOperation(formatter);
+      benchmarkFormatToPartsOperation(formatter);
+    }
+  }
+
+  function benchmarkFormatOperation(formatter) {
+    // Measure the format operation.
+    for (let j = 0; j < 100; j++) {
+      let num = -1e6 + prng() * 2e6;
+      measureFormat.start();
+      formatter.format(num);
+      measureFormat.stop();
+    }
+  }
+
+  function benchmarkFormatToPartsOperation(formatter) {
+    // Measure the formatToParts operation.
+    for (let j = 0; j < 100; j++) {
+      let num = -1e6 + prng() * 2e6;
+      measureFormatToParts.start();
+      formatter.formatToParts(num);
+      measureFormatToParts.stop();
+    }
+  }
+
+  benchmarkNumberFormatConstructor();
+  measureConstructor.reportMetrics();
+  measureFormat.reportMetrics();
+  measureFormatToParts.reportMetrics();
+
+  ok(true);
+});