chore: Memoize debounce time

app/models/concerns/cable_ready/updatable.rb

@@ -206,15 +206,13 @@ def broadcast_updates(model_class, options)
         return if skip_updates_classes.any? { |klass| klass >= self }
         raise("ActionCable must be enabled to use Updatable") unless defined?(ActionCable)
 
-        @debounce_time ||= 0.seconds
-
-        if @debounce_time > 0.seconds
+        if debounce_time > 0.seconds
           key = compound([model_class, *options])
           old_wait_until = CableReady::Updatable.debounce_adapter[key]
           now = Time.now.to_f
 
           if old_wait_until.nil? || old_wait_until < now
-            new_wait_until = now + @debounce_time.to_f
+            new_wait_until = now + debounce_time.to_f
             CableReady::Updatable.debounce_adapter[key] = new_wait_until
             ActionCable.server.broadcast(model_class, options)
           end
@@ -223,6 +221,10 @@ def broadcast_updates(model_class, options)
         end
       end
 
+      def debounce_time
+        @debounce_time ||= 0.seconds
+      end
+
       def skip_updates_classes
         Thread.current[:skip_updates_classes] ||= []
       end