diff --git a/javascript/clusterize.js b/javascript/clusterize.js
index f222aea81..21f3d37ee 100644
--- a/javascript/clusterize.js
+++ b/javascript/clusterize.js
@@ -292,7 +292,8 @@ class Clusterize {
 
         // Get the first element that isn't one of our placeholder rows.
         const node = this.content_elem.querySelector(":scope > :not(.clusterize-extra-row,.clusterize-no-data)");
-        if (!isElementLogError(node)) {
+        if (!isElement(node)) {
+            // dont attempt to compute dims if we have no data.
             return;
         }
 
diff --git a/javascript/extraNetworksClusterize.js b/javascript/extraNetworksClusterize.js
index 96feeee2e..0a5865d84 100644
--- a/javascript/extraNetworksClusterize.js
+++ b/javascript/extraNetworksClusterize.js
@@ -15,6 +15,9 @@
 */
 /*eslint no-undef: "error"*/
 
+// number of list html items to store in cache.
+const EXTRA_NETWORKS_CLUSTERIZE_LRU_CACHE_SIZE = 1000;
+
 class NotImplementedError extends Error {
     constructor(...params) {
         super(...params);
@@ -72,7 +75,7 @@ class ExtraNetworksClusterize extends Clusterize {
         if (this.lru instanceof LRUCache) {
             this.lru.clear();
         } else {
-            this.lru = new LRUCache();
+            this.lru = new LRUCache(EXTRA_NETWORKS_CLUSTERIZE_LRU_CACHE_SIZE);
         }
 
         await this.reinitData();
diff --git a/javascript/utils.js b/javascript/utils.js
index 7a649a81d..b0ff337f6 100644
--- a/javascript/utils.js
+++ b/javascript/utils.js
@@ -411,6 +411,11 @@ function htmlStringToElement(s) {
     return tmp.body.firstElementChild;
 }
 
+function htmlStringToFragment(s) {
+    /** Converts an HTML string into a DocumentFragment. */
+    return document.createRange().createContextualFragment(s);
+}
+
 function toggleCss(key, css, enable) {
     var style = document.getElementById(key);
     if (enable && !style) {