diff --git a/README.md b/README.md
index d75b0b0..86e2529 100644
--- a/README.md
+++ b/README.md
@@ -48,7 +48,7 @@ Thease are some resources that can give you more context:
 - Nested CSS selectors
 - Injects styles into `<style>` tag at run-time
 - Debuggable styles in development (set via `goog.DEBUG`)
-- Fast, 10000 insertions in ~200ms
+- Fast, 1000 insertions in under 100ms
 
 ## How it works
 
diff --git a/example/src/example/perf.cljs b/example/src/example/perf.cljs
new file mode 100644
index 0000000..be99362
--- /dev/null
+++ b/example/src/example/perf.cljs
@@ -0,0 +1,51 @@
+(ns example.perf
+  (:require-macros [cljss.core])
+  (:require [cljss.core :as css :refer-macros [defstyles]]
+            [rum.core :as rum]
+            [goog.dom :as gdom]))
+
+(defstyles button [font-size]
+  {:color            "#fff"
+   :background-color "rgb(0, 0, 255)"
+   :border-radius    "5px"
+   :padding          "8px 24px"
+   :border           "none"
+   :font-size        (str font-size "px")
+   :&:hover          {:background-color "rgb(0, 0, 230)"
+                      :font-size        (str (* 1.2 font-size) "px")}
+   "span"            {:vertical-align "middle"}})
+
+(println "compute defstyles")
+(simple-benchmark [] (button (js/Math.random)) 1000)
+
+(rum/defc NoStylesButton []
+  [:button {} "button"])
+
+(rum/defc InlineButton []
+  (let [font-size (* 10 (js/Math.random))]
+    [:button {:style {:color            "#fff"
+                      :background-color "rgb(0, 0, 255)"
+                      :border-radius    "5px"
+                      :padding          "8px 24px"
+                      :border           "none"
+                      :font-size        (str font-size "px")}}
+     "button"]))
+
+(rum/defc CSSAttrButton []
+  (let [font-size (* 10 (js/Math.random))]
+    [:button {:css {:color            "#fff"
+                    :background-color "rgb(0, 0, 255)"
+                    :border-radius    "5px"
+                    :padding          "8px 24px"
+                    :border           "none"
+                    :font-size        (str font-size "px")}}
+     "button"]))
+
+(println "render NoStylesButton")
+(simple-benchmark [] (rum/mount (NoStylesButton) (gdom/getElement "NoStylesButton")) 1000)
+
+(println "render InlineButton")
+(simple-benchmark [] (rum/mount (InlineButton) (gdom/getElement "InlineButton")) 1000)
+
+(println "render CSSAttrButton")
+(simple-benchmark [] (rum/mount (CSSAttrButton) (gdom/getElement "CSSAttrButton")) 1000)
diff --git a/project.clj b/project.clj
index d759fd5..b0c3740 100644
--- a/project.clj
+++ b/project.clj
@@ -56,4 +56,15 @@
                             :closure-defines {"goog.DEBUG" false}
                             :pseudo-names    true
                             :verbose         true
-                            :pretty-print    false}}]})
+                            :pretty-print    false}}
+            {:id           "perf"
+             :source-paths ["src" "example/src" "example/resources"]
+             :compiler     {:output-to        "example/resources/public/js/compiled/perf.js"
+                            :output-dir       "example/resources/public/js/compiled/out-perf"
+                            :main             example.perf
+                            :optimizations    :advanced
+                            :closure-defines  {"goog.DEBUG" false}
+                            :static-fns       true
+                            :fn-invoke-direct true
+                            :verbose          true
+                            :pretty-print     false}}]})