A SysOps administrator manages an EC2 Auto Scaling group behind an Application Load Balancer for a Java application. Each instance takes about 12 minutes to fully bootstrap because it downloads dependencies, warms a large cache, and initializes the JVM before it can serve traffic. During sudden traffic spikes, target tracking scaling launches new instances, but customers experience elevated latency and errors for several minutes while the new instances complete initialization. The administrator must reduce the time it takes for scaled-out instances to begin serving requests while minimizing ongoing cost. What should the administrator do?