Move the rule defer to after the perf log

lib/core/base/rule.js

@@ -284,15 +284,15 @@ Rule.prototype.run = function run(context, options = {}, resolve, reject) {
     });
   });
 
-  // Defer the rule's execution to prevent "unresponsive script" warnings.
-  // See https://github.com/dequelabs/axe-core/pull/1172 for discussion and details.
-  q.defer(res => setTimeout(res, 0));
-
   q.then(() => {
     if (options.performanceTimer) {
       this._logRulePerformance();
     }
-    resolve(ruleResult);
+    // Defer the rule's execution to prevent "unresponsive script" warnings.
+    // See https://github.com/dequelabs/axe-core/pull/1172 for discussion and details.
+    setTimeout(() => {
+      resolve(ruleResult);
+    }, 0);
   }).catch(error => {
     if (options.performanceTimer) {
       this._logRulePerformance();