diff --git a/src/reitit/core.cljc b/src/reitit/core.cljc
index 8db5a4e5..dd03a71f 100644
--- a/src/reitit/core.cljc
+++ b/src/reitit/core.cljc
@@ -69,10 +69,19 @@
           (reduced (assoc m :route-params params))))
       nil routes)))
 
+(defrecord LookupRouter [routes]
+  Routing
+  (match-route [_ path]
+    (routes path)))
+
 (defn router
   ([data]
    (router data {}))
   ([data opts]
-   (->LinearRouter
-     (for [[p m] (resolve-routes data opts)]
-       [p m (regex/matcher p)]))))
+   (let [routes (resolve-routes data opts)]
+     (if (some regex/contains-wilds? (map first routes))
+       (->LinearRouter
+         (for [[p m] routes]
+           [p m (regex/matcher p)]))
+       (->LookupRouter
+         (into {} routes))))))
diff --git a/test/cljc/reitit/core_test.cljc b/test/cljc/reitit/core_test.cljc
index 1861f5a0..6725fc09 100644
--- a/test/cljc/reitit/core_test.cljc
+++ b/test/cljc/reitit/core_test.cljc
@@ -1,9 +1,26 @@
 (ns reitit.core-test
   (:require [clojure.test :refer [deftest testing is are]]
-            [reitit.core :as reitit]))
+    #?(:clj  [reitit.core :as reitit]
+       :cljs [reitit.core :as reitit :refer [LinearRouter LookupRouter]]))
+  #?(:clj
+     (:import (reitit.core LinearRouter LookupRouter))))
 
 (deftest reitit-test
 
+  (testing "linear router"
+    (let [router (reitit/router ["/api"
+                                 ["/ipa"
+                                  ["/:size"]]])]
+      (is (instance? LinearRouter router))
+      (is (map? (reitit/match-route router "/api/ipa/large")))))
+
+  (testing "lookup router"
+    (let [router (reitit/router ["/api"
+                                 ["/ipa"
+                                  ["/large"]]])]
+      (is (instance? LookupRouter router))
+      (is (map? (reitit/match-route router "/api/ipa/large")))))
+
   (testing "bide sample"
     (let [routes [["/auth/login" :auth/login]
                   ["/auth/recovery/token/:token" :auth/recovery]