diff --git a/app/assets/javascripts/application.js b/app/assets/javascripts/application.js
index 3d689de9f..67202dab6 100644
--- a/app/assets/javascripts/application.js
+++ b/app/assets/javascripts/application.js
@@ -3,6 +3,7 @@
 //= require jquery.hotkeys.js
 //= require jquery.timeout.js
 //= require jquery-ui-autocomplete-custom.js
+//= require jquery.storageapi.js
 //= require rails.js
 //= require common.js
 //= require_self
diff --git a/app/assets/javascripts/autocomplete.js b/app/assets/javascripts/autocomplete.js
index 11d98aa18..2c6253f44 100644
--- a/app/assets/javascripts/autocomplete.js
+++ b/app/assets/javascripts/autocomplete.js
@@ -130,28 +130,7 @@
 
     $fields_single.autocomplete({
       minLength: 1,
-      source: function(req, resp) {
-        $.ajax({
-          url: "/tags.json",
-          data: {
-            "search[order]": "count",
-            "search[name_matches]": req.term + "*",
-            "limit": 10
-          },
-          method: "get",
-          success: function(data) {
-            resp($.map(data, function(tag) {
-              return {
-                type: "tag",
-                label: tag.name.replace(/_/g, " "),
-                value: tag.name,
-                category: tag.category,
-                post_count: tag.post_count
-              };
-            }));
-          }
-        });
-      }
+      source: Danbooru.Autocomplete.normal_source
     });
 
     $.merge($fields_multiple, $fields_single).each(function(i, field) {
@@ -159,6 +138,48 @@
     });
   }
 
+  Danbooru.Autocomplete.normal_source = function(term, resp) {
+    var key = "ac-" + term;
+    var cached = $.localStorage.get(key);
+    if (cached) {
+      if (cached.expires < new Date()) {
+        console.log("localStorage: removing " + key);
+        $.localStorage.remove(key);
+      } else {
+        console.log("localStorage: reading " + key);
+        resp(cached.value);
+        return;
+      }
+    }
+
+    $.ajax({
+      url: "/tags.json",
+      data: {
+        "search[order]": "count",
+        "search[name_matches]": term + "*",
+        "limit": 10
+      },
+      method: "get",
+      success: function(data) {
+        var data = $.map(data, function(tag) {
+          return {
+            type: "tag",
+            label: tag.name.replace(/_/g, " "),
+            value: tag.name,
+            category: tag.category,
+            post_count: tag.post_count
+          };
+        });
+        var expiry = new Date();
+        expiry.setDate(expiry.getDate() + 7);
+        console.log("localStorage: setting " + key);
+        console.log("localStorage: expires at " + expiry);
+        $.localStorage.set(key, {"value": data, "expires": expiry});
+        resp(data);
+      }
+    });
+  }
+
   Danbooru.Autocomplete.render_item = function(list, item) {
     var $link = $("<a/>").text(item.label);
     $link.attr("href", "/posts?tags=" + encodeURIComponent(item.value));
@@ -192,29 +213,6 @@
     return $("<li/>").data("item.autocomplete", item).append($link).appendTo(list);
   };
 
-  Danbooru.Autocomplete.normal_source = function(term, resp) {
-    $.ajax({
-      url: "/tags.json",
-      data: {
-        "search[order]": "count",
-        "search[name_matches]": term + "*",
-        "limit": 10
-      },
-      method: "get",
-      success: function(data) {
-        resp($.map(data, function(tag) {
-          return {
-            type: "tag",
-            label: tag.name.replace(/_/g, " "),
-            value: tag.name,
-            category: tag.category,
-            post_count: tag.post_count
-          };
-        }));
-      }
-    });
-  }
-
   Danbooru.Autocomplete.static_metatags = {
     order: [
       "id", "id_desc",
diff --git a/vendor/assets/javascripts/jquery.storageapi.js b/vendor/assets/javascripts/jquery.storageapi.js
new file mode 100644
index 000000000..d23b72bda
--- /dev/null
+++ b/vendor/assets/javascripts/jquery.storageapi.js
@@ -0,0 +1,2 @@
+/* jQuery Storage API Plugin 1.7.0 https://github.com/julien-maurel/jQuery-Storage-API */
+!function(e){function t(t){var r,n,i,o=arguments.length,s=window[t],a=arguments,u=a[1];if(2>o)throw Error("Minimum 2 arguments must be given");if(e.isArray(u)){n={};for(var f in u){r=u[f];try{n[r]=JSON.parse(s.getItem(r))}catch(c){n[r]=s.getItem(r)}}return n}if(2!=o){try{n=JSON.parse(s.getItem(u))}catch(c){throw new ReferenceError(u+" is not defined in this storage")}for(var f=2;o-1>f;f++)if(n=n[a[f]],void 0===n)throw new ReferenceError([].slice.call(a,1,f+1).join(".")+" is not defined in this storage");if(e.isArray(a[f])){i=n,n={};for(var m in a[f])n[a[f][m]]=i[a[f][m]];return n}return n[a[f]]}try{return JSON.parse(s.getItem(u))}catch(c){return s.getItem(u)}}function n(t){var r,n,i=arguments.length,o=window[t],s=arguments,a=s[1],u=s[2],f={};if(2>i||!e.isPlainObject(a)&&3>i)throw Error("Minimum 3 arguments must be given or second parameter must be an object");if(e.isPlainObject(a)){for(var c in a)r=a[c],e.isPlainObject(r)?o.setItem(c,JSON.stringify(r)):o.setItem(c,r);return a}if(3==i)return"object"==typeof u?o.setItem(a,JSON.stringify(u)):o.setItem(a,u),u;try{n=o.getItem(a),null!=n&&(f=JSON.parse(n))}catch(m){}n=f;for(var c=2;i-2>c;c++)r=s[c],n[r]&&e.isPlainObject(n[r])||(n[r]={}),n=n[r];return n[s[c]]=s[c+1],o.setItem(a,JSON.stringify(f)),f}function i(t){var r,n,i=arguments.length,o=window[t],s=arguments,a=s[1];if(2>i)throw Error("Minimum 2 arguments must be given");if(e.isArray(a)){for(var u in a)o.removeItem(a[u]);return!0}if(2==i)return o.removeItem(a),!0;try{r=n=JSON.parse(o.getItem(a))}catch(f){throw new ReferenceError(a+" is not defined in this storage")}for(var u=2;i-1>u;u++)if(n=n[s[u]],void 0===n)throw new ReferenceError([].slice.call(s,1,u).join(".")+" is not defined in this storage");if(e.isArray(s[u]))for(var c in s[u])delete n[s[u][c]];else delete n[s[u]];return o.setItem(a,JSON.stringify(r)),!0}function o(t,r){var n=u(t);for(var o in n)i(t,n[o]);if(r)for(var o in e.namespaceStorages)f(o)}function s(r){var n=arguments.length,i=arguments,o=(window[r],i[1]);if(1==n)return 0==u(r).length;if(e.isArray(o)){for(var a=0;a<o.length;a++)if(!s(r,o[a]))return!1;return!0}try{var f=t.apply(this,arguments);e.isArray(i[n-1])||(f={totest:f});for(var a in f)if(!(e.isPlainObject(f[a])&&e.isEmptyObject(f[a])||e.isArray(f[a])&&!f[a].length)&&f[a])return!1;return!0}catch(c){return!0}}function a(r){var n=arguments.length,i=arguments,o=(window[r],i[1]);if(2>n)throw Error("Minimum 2 arguments must be given");if(e.isArray(o)){for(var s=0;s<o.length;s++)if(!a(r,o[s]))return!1;return!0}try{var u=t.apply(this,arguments);e.isArray(i[n-1])||(u={totest:u});for(var s in u)if(void 0===u[s]||null===u[s])return!1;return!0}catch(f){return!1}}function u(r){var n=arguments.length,i=window[r],o=arguments,s=(o[1],[]),a={};if(a=n>1?t.apply(this,o):i,a._cookie)for(var u in e.cookie())""!=u&&s.push(u.replace(a._prefix,""));else for(var f in a)s.push(f);return s}function f(t){if(!t||"string"!=typeof t)throw Error("First parameter must be a string");window.localStorage.getItem(t)||window.localStorage.setItem(t,"{}"),window.sessionStorage.getItem(t)||window.sessionStorage.setItem(t,"{}");var r={localStorage:e.extend({},e.localStorage,{_ns:t}),sessionStorage:e.extend({},e.sessionStorage,{_ns:t})};return e.cookie&&(window.cookieStorage.getItem(t)||window.cookieStorage.setItem(t,"{}"),r.cookieStorage=e.extend({},e.cookieStorage,{_ns:t})),e.namespaceStorages[t]=r,r}var c="ls_",m="ss_",g={_type:"",_ns:"",_callMethod:function(e,t){var r=[this._type],t=Array.prototype.slice.call(t),n=t[0];return this._ns&&r.push(this._ns),"string"==typeof n&&-1!==n.indexOf(".")&&(t.shift(),[].unshift.apply(t,n.split("."))),[].push.apply(r,t),e.apply(this,r)},get:function(){return this._callMethod(t,arguments)},set:function(){var t=arguments.length,i=arguments,o=i[0];if(1>t||!e.isPlainObject(o)&&2>t)throw Error("Minimum 2 arguments must be given or first parameter must be an object");if(e.isPlainObject(o)&&this._ns){for(var s in o)n(this._type,this._ns,s,o[s]);return o}return r=this._callMethod(n,i),this._ns?r[o.split(".")[0]]:r},remove:function(){if(arguments.length<1)throw Error("Minimum 1 argument must be given");return this._callMethod(i,arguments)},removeAll:function(e){return this._ns?(n(this._type,this._ns,{}),!0):o(this._type,e)},isEmpty:function(){return this._callMethod(s,arguments)},isSet:function(){if(arguments.length<1)throw Error("Minimum 1 argument must be given");return this._callMethod(a,arguments)},keys:function(){return this._callMethod(u,arguments)}};if(e.cookie){window.name||(window.name=Math.floor(1e8*Math.random()));var h={_cookie:!0,_prefix:"",_expires:null,_path:null,_domain:null,setItem:function(t,r){e.cookie(this._prefix+t,r,{expires:this._expires,path:this._path,domain:this._domain})},getItem:function(t){return e.cookie(this._prefix+t)},removeItem:function(t){return e.removeCookie(this._prefix+t)},clear:function(){for(var t in e.cookie())""!=t&&(!this._prefix&&-1===t.indexOf(c)&&-1===t.indexOf(m)||this._prefix&&0===t.indexOf(this._prefix))&&e.removeCookie(t)},setExpires:function(e){return this._expires=e,this},setPath:function(e){return this._path=e,this},setDomain:function(e){return this._domain=e,this},setConf:function(e){return e.path&&(this._path=e.path),e.domain&&(this._domain=e.domain),e.expires&&(this._expires=e.expires),this},setDefaultConf:function(){this._path=this._domain=this._expires=null}};window.localStorage||(window.localStorage=e.extend({},h,{_prefix:c,_expires:3650}),window.sessionStorage=e.extend({},h,{_prefix:m+window.name+"_"})),window.cookieStorage=e.extend({},h),e.cookieStorage=e.extend({},g,{_type:"cookieStorage",setExpires:function(e){return window.cookieStorage.setExpires(e),this},setPath:function(e){return window.cookieStorage.setPath(e),this},setDomain:function(e){return window.cookieStorage.setDomain(e),this},setConf:function(e){return window.cookieStorage.setConf(e),this},setDefaultConf:function(){return window.cookieStorage.setDefaultConf(),this}})}e.initNamespaceStorage=function(e){return f(e)},e.localStorage=e.extend({},g,{_type:"localStorage"}),e.sessionStorage=e.extend({},g,{_type:"sessionStorage"}),e.namespaceStorages={},e.removeAllStorages=function(t){e.localStorage.removeAll(t),e.sessionStorage.removeAll(t),e.cookieStorage&&e.cookieStorage.removeAll(t),t||(e.namespaceStorages={})}}(jQuery);
\ No newline at end of file