fix: for more accuracy Date.now replaced with performance.now

Author: behnammodi

test.js

@@ -8,9 +8,9 @@ function test(max) {
 	return sum;
 }
 
-var start = new Date().getTime();
+var start = performance.now();
 test(100000000);
-var end = new Date().getTime();
+var end = performance.now();
 var time = end - start;
 
 process.stdout.write("JavaScript: " + time + "ms\n");