diff --git a/CHANGES.md b/CHANGES.md
index f20b99c..71152b0 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -3,6 +3,7 @@
 * Huge performance improvement for ALL transform on maps and vectors
 * Significant performance improvements for FIRST/LAST for vectors
 * Huge performance improvements for `if-path`, `cond-path`, `selected?`, and `not-selected?`, especially for condition path containing only static functions
+* Huge performance improvement for `END` on vectors
 * Added specialized MAP-VALS navigator that is twice as fast as using [ALL LAST]
 * Eliminated compiler warnings for ClojureScript version
 * Dropped support for Clojurescript below v1.7.10
diff --git a/project.clj b/project.clj
index 9f2ab74..a646ba8 100644
--- a/project.clj
+++ b/project.clj
@@ -14,7 +14,8 @@
   :codox {:source-paths ["target/classes" "src/clj"]
           :namespaces [com.rpl.specter
                        com.rpl.specter.macros
-                       com.rpl.specter.zipper]
+                       com.rpl.specter.zipper
+                       com.rpl.specter.protocols]
           :source-uri
             {#"target/classes" "https://github.com/nathanmarz/specter/tree/{version}/src/clj/{classpath}x#L{line}"
              #".*"             "https://github.com/nathanmarz/specter/tree/{version}/src/clj/{classpath}#L{line}"
diff --git a/scripts/benchmarks.clj b/scripts/benchmarks.clj
index 2ad07f1..939f1a3 100644
--- a/scripts/benchmarks.clj
+++ b/scripts/benchmarks.clj
@@ -51,7 +51,6 @@
        (println "\n********************************\n")
        )))
 
-
 (let [data {:a {:b {:c 1}}}
       p (comp-paths :a :b :c)]
   (run-benchmark "get value in nested map" 10000000
@@ -104,6 +103,12 @@
     (->> data (mapv :a) (filter even?) doall)
     ))
 
+(let [v (vec (range 1000))]
+  (run-benchmark "END on large vector"
+    5000000
+    (setval END [1] v)
+    (reduce conj v [1])
+    (conj v 1)))
 
 (defn- update-pair [[k v]]
   [k (inc v)])
diff --git a/src/clj/com/rpl/specter.cljx b/src/clj/com/rpl/specter.cljx
index b205630..b3c93ba 100644
--- a/src/clj/com/rpl/specter.cljx
+++ b/src/clj/com/rpl/specter.cljx
@@ -252,16 +252,28 @@
       (reverse (i/matching-ranges structure pred))
       )))
 
-(def
+(defnav
   ^{:doc "Navigate to the empty subsequence before the first element of the collection."}
   BEGINNING
-  (srange 0 0))
+  []
+  (select* [this structure next-fn]
+    (next-fn []))
+  (transform* [this structure next-fn]
+    (let [to-prepend (next-fn [])]
+      (i/prepend-all structure to-prepend)
+      )))
 
-(def
+(defnav
  ^{:doc "Navigate to the empty subsequence after the last element of the collection."}
   END
-  (srange-dynamic count count))
-
+  []
+  (select* [this structure next-fn]
+    (next-fn []))
+  (transform* [this structure next-fn]
+    (let [to-append (next-fn [])]
+      (i/append-all structure to-append)
+      )))
+  
 (defnav
   ^{:doc "Navigates to the specified subset (by taking an intersection).
           In a transform, that subset in the original set is changed to the
diff --git a/src/clj/com/rpl/specter/impl.cljx b/src/clj/com/rpl/specter/impl.cljx
index d9ed666..f69998e 100644
--- a/src/clj/com/rpl/specter/impl.cljx
+++ b/src/clj/com/rpl/specter/impl.cljx
@@ -474,6 +474,30 @@
 (defn- append [coll elem]
   (-> coll vec (conj elem)))
 
+(defprotocol AddExtremes
+  (append-all [structure elements])
+  (prepend-all [structure elements]))
+
+(extend-protocol AddExtremes
+  #+clj clojure.lang.PersistentVector #+cljs cljs.core/PersistentVector
+  (append-all [structure elements]
+    (reduce conj structure elements))
+  (prepend-all [structure elements]
+    (let [ret (transient [])]
+      (as-> ret <>
+            (reduce conj! <> elements)
+            (reduce conj! <> structure)
+            (persistent! <>)
+            )))
+
+  #+clj Object #+cljs default
+  (append-all [structure elements]
+    (concat structure elements))
+  (prepend-all [structure elements]
+    (concat elements structure))
+  )
+
+
 (defprotocol UpdateExtremes
   (update-first [s afn])
   (update-last [s afn]))