diff --git a/classes/class_cache.php b/classes/class_cache.php
index 3b4fdc8d..8521dd3c 100644
--- a/classes/class_cache.php
+++ b/classes/class_cache.php
@@ -34,6 +34,10 @@ class CACHE extends Memcache {
 	public $MemcacheDBKey = '';
 	protected $InTransaction = false;
 	public $Time = 0;
+	private $PersistentKeys = array(
+		'stats_*',
+		'percentiles_*',
+	);
 	
 	public $CanClear = false;
 
@@ -77,14 +81,16 @@ public function get_value($Key, $NoCache=false) {
 			trigger_error("Cache retrieval failed for empty key");
 		}
 
-		if (isset($_GET['clearcache']) && $this->CanClear) {
+		if (isset($_GET['clearcache']) && $this->CanClear && !in_array_partial($Key, $this->PersistentKeys)) {
 			if ($_GET['clearcache'] == 1) {
 				//Because check_perms isn't true until loggeduser is pulled from the cache, we have to remove the entries loaded before the loggeduser data
 				//Because of this, not user cache data will require a secondary pageload following the clearcache to update
 				if (count($this->CacheHits) > 0) {
-					foreach ($this->CacheHits as $Key => $Entry) {
-						$this->delete($Key);
-						unset($this->CacheHits[$Key]);
+					foreach (array_keys($this->CacheHits) as $HitKey) {
+						if (!in_array_partial($HitKey, $this->PersistentKeys)) {
+							$this->delete($HitKey);
+							unset($this->CacheHits[$HitKey]);
+						}
 					}
 				}
 				$this->delete($Key);
diff --git a/classes/script_start.php b/classes/script_start.php
index 656a1b31..da6051d3 100644
--- a/classes/script_start.php
+++ b/classes/script_start.php
@@ -1901,6 +1901,31 @@ function starts_with($Haystack, $Needle) {
 	return strpos($Haystack, $Needle) === 0;
 }
 
+/**
+ * Variant of in_array() with trailing wildcard support
+ * @param string $Needle, array $Haystack
+ * @return true if (substring of) $Needle exists in $Haystack
+ */
+function in_array_partial($Needle, $Haystack) {
+	static $Searches = array();
+	if(array_key_exists($Needle, $Searches)) {
+		return $Searches[$Needle];
+	}
+	foreach($Haystack as $String) {
+		if(substr($String, -1) == '*') {
+			if(!strncmp($Needle, $String, strlen($String)-1)) {
+				$Searches[$Needle] = true;
+				return true;
+			}
+		} elseif(!strcmp($Needle, $String)) {
+			$Searches[$Needle] = true;
+			return true;
+		}
+	}
+	$Searches[$Needle] = false;
+	return false;
+}
+
 
 
 $Debug->set_flag('ending function definitions');