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API Gateway has a limit of 10,000 RPS (requests per second), which might not be enough for some cases. Application Load Balancer (ALB) is virtually unlimited in terms of connections per second. ALB can easily scale to handle +100,000’s RPS in a second and, in principle, could go beyond millions of RPS as well at these levels. API Gateway is highly reliable and available out of the box, developers do not have to worry about anything here.