diff --git a/app/services/card_image_loading_service.rb b/app/services/card_image_loading_service.rb
index 09de13f..f7dd2d8 100644
--- a/app/services/card_image_loading_service.rb
+++ b/app/services/card_image_loading_service.rb
@@ -17,7 +17,7 @@ def initialize(logger: nil, suppress_progress: false)
   def import
     barrier = Async::Barrier.new
     Sync do
-      semaphore = Async::Semaphore.new(10, parent: barrier)
+      semaphore = Async::Semaphore.new(8, parent: barrier)
 
       (1..22).map do |disk|
         semaphore.async do