diff --git a/src/utils.php b/src/utils.php
index c13f1be..2ed1c6a 100644
--- a/src/utils.php
+++ b/src/utils.php
@@ -138,11 +138,22 @@ function stripStringOverlap(string $a, string $b): string
  * in ascending order.
  *
  * @param array
- * @return array
+ * @return void
  */
 function sortUrisLevelOrder(&$uriList)
 {
-    usort($uriList, function ($a, $b) {
-        return substr_count(Uri\parse($a)['path'], '/') - substr_count(Uri\parse($b)['path'], '/');
+    // Parse URIs so we are not continually parsing them while sorting
+    $parsedUriList = array_map(function ($uri) {
+        return Uri\parse($uri);
+    }, $uriList);
+
+    // Sort by number of slashes in parsed URI path, ascending
+    usort($parsedUriList, function ($a, $b) {
+        return substr_count($a['path'], '/') - substr_count($b['path'], '/');
     });
+
+    // Reassemble the URIs
+    $uriList = array_map(function ($parsedUri) {
+        return Uri\build($parsedUri);
+    }, $parsedUriList);
 }