Index: benchmark/creation/node_cor.js
===================================================================
--- benchmark/creation/node_cor.js	(revision dd9e1cab0e0196cfe78037c0f0b19d85fdc28482)
+++ benchmark/creation/node_cor.js	(revision 3c64c6684cc8f107bdea7411e2d29dfffaa2a544)
@@ -5,4 +5,9 @@
 
 function * coroutine() { yield }
+
+for ( var i = 0; i < times; i += 1 ) { // warm JIT
+	cor = coroutine()
+}
+
 var hrstart = process.hrtime()
 for ( var i = 0; i < times; i += 1 ) {
Index: benchmark/ctxswitch/node_cor.js
===================================================================
--- benchmark/ctxswitch/node_cor.js	(revision dd9e1cab0e0196cfe78037c0f0b19d85fdc28482)
+++ benchmark/ctxswitch/node_cor.js	(revision 3c64c6684cc8f107bdea7411e2d29dfffaa2a544)
@@ -10,4 +10,8 @@
 }
 cor = coroutine()
+
+for ( var i = 0; i < times; i += 1 ) { // warm JIT
+	cor.next();
+}
 
 var hrstart = process.hrtime()