Lowered subscription caching to improve performance

rpg-docs/lib/constants/subsManager.js

@@ -1 +1,6 @@
-subsManager = new SubsManager();
+subsManager = new SubsManager({
+	// maximum number of cache subscriptions
+	cacheLimit: 5,
+	// any subscription will be expire after 1 minute, if it's not subscribed again
+	expireIn: 1,
+});