diff --git a/.gitignore b/.gitignore
index c1e2b47e..b5dfb494 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,7 @@
 lib/bem*/bundle.js
 /node_modules/
 npm-debug.log
+/.idea/
+/coverage/
+/bench/bem-xjst-*/
+/bench/dat-*/
diff --git a/lib/bemhtml/index.js b/lib/bemhtml/index.js
index 5446d387..1398bd22 100644
--- a/lib/bemhtml/index.js
+++ b/lib/bemhtml/index.js
@@ -279,13 +279,31 @@ BEMHTML.prototype.renderAttrs = function(attrs, ctx) {
   return out;
 };
 
+var BEMHTMLSet = typeof Set !== 'undefined' ?
+  Set :
+  (function() {
+    var MiniSet = function() {
+      this._storage = {};
+    };
+
+    MiniSet.prototype.add = function(item) {
+      this._storage[item] = true;
+    };
+
+    MiniSet.prototype.has = function(item) {
+      return this._storage[item] || false;
+    };
+
+    return MiniSet;
+  })();
+
 BEMHTML.prototype.renderMix = function(entity, mix, jsParams, addJSInitClass) {
-  var visited = {};
+  var visited = new BEMHTMLSet();
   var context = this.context;
   var js = jsParams;
   var addInit = addJSInitClass;
 
-  visited[entity.jsClass] = true;
+  visited.add(entity.jsClass);
 
   // Transform mix to the single-item array if it's not array
   if (!Array.isArray(mix))
@@ -335,11 +353,11 @@ BEMHTML.prototype.renderMix = function(entity, mix, jsParams, addJSInitClass) {
         addInit = block && !item.elem;
     }
 
-    // Process nested mixes
-    if (!hasItem || visited[key])
+    // Process nested mixes from templates
+    if (!hasItem || visited.has(key))
       continue;
 
-    visited[key] = true;
+    visited.add(key);
     var nestedEntity = this.entities[key];
     if (!nestedEntity)
       continue;
@@ -360,7 +378,7 @@ BEMHTML.prototype.renderMix = function(entity, mix, jsParams, addJSInitClass) {
 
       if (!nestedItem.block &&
           !nestedItem.elem ||
-          !visited[classBuilder.build(nestedItem.block, nestedItem.elem)]) {
+          !visited.has(classBuilder.build(nestedItem.block, nestedItem.elem))) {
         if (nestedItem.block) continue;
 
         nestedItem._block = block;