add tip

middlewares/ServiceGuard.js

@@ -15,6 +15,7 @@ module.exports = {
 					throw new MoleculerClientError("Service token is missing", 401, "TOKEN_MISSING");
 
 				// Verify token & restricted services
+				// Tip: For better performance, you can cache the response because it won't change in runtime.
 				await ctx.call("guard.check", { token, services: action.restricted })
 
 				// Call the original handler