diff --git a/src/main.cpp b/src/main.cpp
index 6dcfa2b..3a72df1 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -249,6 +249,13 @@ void interactive(chaiscript::ChaiScript& chai)
   }
 }
 
+double now()
+{
+  using namespace std::chrono;
+  auto now = high_resolution_clock::now();
+  return duration_cast<duration<double>>(now.time_since_epoch()).count();
+}
+
 int main(int argc, char *argv[])
 {
 
@@ -288,6 +295,8 @@ int main(int argc, char *argv[])
   chai.add(chaiscript::fun(&help), "help");
   chai.add(chaiscript::fun(&throws_exception), "throws_exception");
   chai.add(chaiscript::fun(&get_eval_error), "get_eval_error");
+  chai.add(chaiscript::fun(&now), "now");
+
 
   for (int i = 0; i < argc; ++i) {
     if ( i == 0 && argc > 1 ) {
diff --git a/unittests/performance.chai b/unittests/performance.chai
new file mode 100644
index 0000000..1345c74
--- /dev/null
+++ b/unittests/performance.chai
@@ -0,0 +1,13 @@
+var sum = 0.0
+var start = now()
+for (var i = 1; i <= 100000; ++i) {
+  if (i % 2 == 0) {
+    sum += 1.0 / i;
+  }
+  else {
+    sum += 1.0 / (double(i) * i);
+  }
+}
+var end = now()
+print("Elapsed time: " + to_string(end - start) + " sum: " + to_string(sum))
+assert_equal(to_string(sum), "6.9322")