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Your web application consists of 10% writes and 90% reads. You currently service all requests through a Route53 Alias Record directed towards an AWS ELB, which sits in front of an EC2 Auto Scaling Group. Your system is getting very expensive when there are large read traffic spikes during certain news events, during which many more people access your web application, all at the same time. What is the simplest and cheapest way to reduce costs and scale with spikes like this?