At around, say, 10k requests/sec, by far the dominant cost is the s3 api cost for GET requests at $.0004 per 1000 calls. Having a cache saves millions of dolla

At around, say, 10k requests/sec, by far the dominant cost is the s3 api cost for GET requests at $.0004 per 1000 calls. Having a cache saves millions of dollars per month in this scenario, and if scaling is expected, then planning ahead like this is a good idea.