diff --git a/src/Checks/Performance/ImageSizeCheck.php b/src/Checks/Performance/ImageSizeCheck.php
index 8884f75..255099d 100644
--- a/src/Checks/Performance/ImageSizeCheck.php
+++ b/src/Checks/Performance/ImageSizeCheck.php
@@ -65,10 +65,10 @@ public function validateContent(Crawler $crawler): bool
                 return true;
             }
 
-            $image = file_get_contents($url);
+            $imageSize = getRemoteFileSize($url);
 
-            if (strlen($image) > 1000000) {
-                $size = bytesToHumanReadable(strlen($image));
+            if ($imageSize > 1000000) {
+                $size = bytesToHumanReadable($imageSize);
 
                 $links[] = $url.' (size: '.$size.')';