diff --git a/benchmark/misc/console.js b/benchmark/misc/console.js
index 9a08a411c51f82..9c5aec0eeeb5fa 100644
--- a/benchmark/misc/console.js
+++ b/benchmark/misc/console.js
@@ -4,9 +4,6 @@ const common = require('../common.js');
 const assert = require('assert');
 const Writable = require('stream').Writable;
 const util = require('util');
-const v8 = require('v8');
-
-v8.setFlagsFromString('--allow_natives_syntax');
 
 const methods = [
   'restAndSpread',
@@ -51,14 +48,7 @@ function usingArgumentsAndApplyC() {
   nullStream.write(util.format.apply(null, arguments) + '\n');
 }
 
-function optimize(method, ...args) {
-  method(...args);
-  eval(`%OptimizeFunctionOnNextCall(${method.name})`);
-  method(...args);
-}
-
 function runUsingRestAndConcat(n) {
-  optimize(usingRestAndConcat, 'a', 1);
 
   var i = 0;
   bench.start();
@@ -70,7 +60,6 @@ function runUsingRestAndConcat(n) {
 function runUsingRestAndSpread(n, concat) {
 
   const method = concat ? usingRestAndSpreadC : usingRestAndSpreadTS;
-  optimize(method, 'this is %s of %d', 'a', 1);
 
   var i = 0;
   bench.start();
@@ -82,7 +71,6 @@ function runUsingRestAndSpread(n, concat) {
 function runUsingRestAndApply(n, concat) {
 
   const method = concat ? usingRestAndApplyC : usingRestAndApplyTS;
-  optimize(method, 'this is %s of %d', 'a', 1);
 
   var i = 0;
   bench.start();
@@ -94,7 +82,6 @@ function runUsingRestAndApply(n, concat) {
 function runUsingArgumentsAndApply(n, concat) {
 
   const method = concat ? usingArgumentsAndApplyC : usingArgumentsAndApplyTS;
-  optimize(method, 'this is %s of %d', 'a', 1);
 
   var i = 0;
   bench.start();
diff --git a/benchmark/misc/punycode.js b/benchmark/misc/punycode.js
index f4d22557ac5d65..b359fbbff4bbc6 100644
--- a/benchmark/misc/punycode.js
+++ b/benchmark/misc/punycode.js
@@ -42,8 +42,9 @@ function usingICU(val) {
 }
 
 function runPunycode(n, val) {
-  common.v8ForceOptimization(usingPunycode, val);
   var i = 0;
+  for (; i < n; i++)
+    usingPunycode(val);
   bench.start();
   for (; i < n; i++)
     usingPunycode(val);
@@ -51,7 +52,6 @@ function runPunycode(n, val) {
 }
 
 function runICU(n, val) {
-  common.v8ForceOptimization(usingICU, val);
   var i = 0;
   bench.start();
   for (; i < n; i++)
diff --git a/benchmark/misc/util-extend-vs-object-assign.js b/benchmark/misc/util-extend-vs-object-assign.js
index caea42ce914cf5..41c15d7d2caa0c 100644
--- a/benchmark/misc/util-extend-vs-object-assign.js
+++ b/benchmark/misc/util-extend-vs-object-assign.js
@@ -2,7 +2,6 @@
 
 const common = require('../common.js');
 const util = require('util');
-const v8 = require('v8');
 
 const bench = common.createBenchmark(main, {
   type: ['extend', 'assign'],
@@ -12,15 +11,11 @@ const bench = common.createBenchmark(main, {
 function main(conf) {
   let fn;
   const n = conf.n | 0;
-  let v8command;
 
   if (conf.type === 'extend') {
     fn = util._extend;
-    v8command = '%OptimizeFunctionOnNextCall(util._extend)';
   } else if (conf.type === 'assign') {
     fn = Object.assign;
-    // Object.assign is built-in, cannot be optimized
-    v8command = '';
   }
 
   // Force-optimize the method to test so that the benchmark doesn't
@@ -28,9 +23,6 @@ function main(conf) {
   for (var i = 0; i < conf.type.length * 10; i += 1)
     fn({}, process.env);
 
-  v8.setFlagsFromString('--allow_natives_syntax');
-  eval(v8command);
-
   var obj = new Proxy({}, { set: function(a, b, c) { return true; } });
 
   bench.start();