diff --git a/harness/atomicsHelper.js b/harness/atomicsHelper.jsindex 9c1217351e..3c24755558 100644--- a/harness/atomicsHelper.js+++ b/harness/atomicsHelper.js@@ -227,10 +227,14 @@ $262.agent.waitUntil = function(typedArray, index, expected) {  *   }  */ $262.agent.timeouts = {-  yield: 100,-  small: 200,-  long: 1000,-  huge: 10000,+//  yield: 100,+//  small: 200,+//  long: 1000,+//  huge: 10000,+  yield: 20,+  small: 20,+  long: 100,+  huge: 1000, };  /**diff --git a/harness/regExpUtils.js b/harness/regExpUtils.jsindex be7039fda0..7b38abf8df 100644--- a/harness/regExpUtils.js+++ b/harness/regExpUtils.js@@ -6,24 +6,27 @@ description: | defines: [buildString, testPropertyEscapes, matchValidator] ---*/ +if ($262 && typeof $262.codePointRange === "function") {+    /* use C function to build the codePointRange (much faster with+       slow JS engines) */+    codePointRange = $262.codePointRange;+} else {+    codePointRange = function codePointRange(start, end) {+        const codePoints = [];+        let length = 0;+        for (codePoint = start; codePoint < end; codePoint++) {+            codePoints[length++] = codePoint;+        }+        return String.fromCodePoint.apply(null, codePoints);+    }+}+ function buildString({ loneCodePoints, ranges }) {-  const CHUNK_SIZE = 10000;-  let result = Reflect.apply(String.fromCodePoint, null, loneCodePoints);-  for (let i = 0; i < ranges.length; i++) {-    const range = ranges[i];-    const start = range[0];-    const end = range[1];-    const codePoints = [];-    for (let length = 0, codePoint = start; codePoint <= end; codePoint++) {-      codePoints[length++] = codePoint;-      if (length === CHUNK_SIZE) {-        result += Reflect.apply(String.fromCodePoint, null, codePoints);-        codePoints.length = length = 0;-      }+    let result = String.fromCodePoint.apply(null, loneCodePoints);+    for (const [start, end] of ranges) {+        result += codePointRange(start, end + 1);     }-    result += Reflect.apply(String.fromCodePoint, null, codePoints);-  }-  return result;+    return result; }  function testPropertyEscapes(regex, string, expression) {